LIBRARY OF CONGRESS. 



Chap,.: Copyright No... 

' Shelf„_i.C_5. r c 

/-&2L7 



UNITED STATES OF AMERICA. 



A Treatise 



MILLING 

AND 

Milling Machines 



The Cincinnati /Hilling Machine Co. 

CINCINNATI. OHIO, U. S. A. 



Cincinnati^ Ohio : 

The Cincinnati Milling Machine Company. 

April, 1897. 



\%% w -C - ' 



Copyright 1897, 

BY 

The Cincinnati Milling Machine Co. 





PREFACE. 



This treatise is published in answer to a demand from 
those wishing to become more familiar with the construction 
and use of milling machines. The important parts of the 
Universal and Plain Milling Machines are clearly and concisely 
described. A number of examples of milling operations are 
shown to illustrate the advantages which these machines possess 
for manufacturing purposes. 



INTRODUCTION 



THE use of Milling Machines during the past few years has 
been largely extended, as the advantages they possess for 
certain classes of work have become better understood. At 
the same time, great improvements have been made in the 
construction of these machines to adapt them to a larger 
variety of work. The constant aim of the designer has been 
to increase the range of these machines with the result that 
to-day they are used on work that a few years ago was thought 
not possible to be done on milling machines. Specialization 
in their manufacture has also contributed to this result. For 
many years w T e have confined our attention exclusively to that 
type of milling machines which is known as the pillar and 
knee type, comprising two classes, viz., Plain and Universal. 
In this way it has been possible for us to develope every detail 
of design and workmanship to a high degree of excellence. 
Our buildings are modern and well lighted and of ample size 
to afford an economical arrangement of machinery. Our 
machinery is modern, much of it being of our own design and 
especially adapted to our particular requirements. Jigs and 
special fixtures are employed throughout to insure both 
economy in manufacture and interchangeability of parts. * We 
extend a cordial invitation to any one interested in metal 
working machinery to visit us. This will afford an opportu- 
nity of becoming more familiar with the use of milling machines, 
as developed on our own work, and at the same time, permit 
intending purchasers of milling machines, to thoroughly ac- 
quaint themselves with the merits which our machines possess, 
both as to design and workmanship. 

The Cincinnati Miixing Machine Co. 



THE CINCINNA TI MILLING MA CHINE CO. 



CONTENTS. 



PAGE. 

Preface, 3 

Introduction, 5 

Contents, 6-7 

Description of No. 1 Universal, 8-14 

Description of Universal Indexing and Dividing Head, . . , 15-17 

Description of Sector, 18-19 

Table of Special Divisions, 20 

Description of Tail Stock, 21 

Description of Spindle for Back-Geared Machines, .... 22-23 

Section of Front Box, 24 

Description of Gear Box, 25-27 

No. 1 Universal Milling Machine, 28-29 

No. iy 2 " " 30-31 

No. 2 " " 32-33 

No. 3 " " 34-35 

General Dimensions of Universal Milling Machines, ... 36 

Plain Milling Machines, 37 

No. o Plain Milling Machine, 38-39 

No. 1 " " '* 40-41 

No. 2 " " " 42-43 

No. 3 " " " 44-45 

No. 2 " " " (showing all Automatic Feeds), . 46 

General Dimensions of Plain Milling Machines, .... 47 

Attachments for Milling Machines, 48 

Universal Indexing and Dividing Head, 49-50 

Plain Indexing Centers, . . . 51 

Rack Cutting Attachment, 52 and 68 

High Speed Milling Attachment, 53 

Vertical Spindle Milling Attachment, 54 

Cam Cutting Attachment, 55~56 



THE CINCINNATI MILLING MACHINE CO. 



PAGE. 

Rotary Milling Attachment, 57 

Vises, 5^ 

Arbors for Milling Machines, ........ 59 

A New Milling Machine Dog, ........ 60-61 

Cutters, 62-67 

Examples of Mining : 

Miscellaneous, .......... 69-81 

Cutting Bevel and Miter Wheels, 82-84 

Worm Wheels, 85-86 

Spiral Gear Cutting, 87-90 

Special Jig Milling, 94-103 

Change Gears for Cutting Spirals, . 91-93 

Erection and Care of the Machine, ...... 104-106 

Design, Features, Workmanship, 107-112 

Tables : 

Tables of Angles and Gearing for Spirals, . . . 113-116 

Table used for Making Standard Spiral Milling Cutters, . 117 

Table used in Connection with the Universal Indexing and 

Dividing Head, 118-119 

Table for Cutting Racks, 120-121 

Table showing Depth of Space and Thickness of Tooth in 

Spur Wheels, 122 

Comparative Table of Circular and Diametral Pitch, . . 123 

Table of Decimal Equivalents, .124 

Table of Decimal Equivalents of Millimetres and Fractions 

of Millimetres, 125 

Speed of Cutters for Cast Iron , 126 



THE CINCINNA TI MILLING MA CHINE CO. 




FIG. 1. 



THE CINCINNATI MILLING MACHINE CO. 



No. I UNIVERSAL. 



The name ' ' Universal ' ' applied to Milling Machines 
is now understood to designate a machine adapted to n,versa • 
the automatic cutting of spirals. The swivel carriage 
in this machine swivels on its saddle, permitting the 
table to be turned to any angle. 

The following description applies to the No. i Uni- 
versal Milling Machine. We select this small machine 
for detail description as it embodies nearly all the 
features found in our other universal machines. This 
machine is completely universal in all its movements. 
The table may be completely revolved through 360 
degrees, allowing spirals to be cut beyond 45 degrees. 

The feeds are automatic in their horizontal directions, Automatic 
are reversible without crossing the feed-belt, and can Feeds, 
be automatically tripped in either direction. 

This size finds its greatest usefulness in the tool- 
room, as ever} T kind of operation can be performed upon 
it, which can be performed upon the larger sizes of the 
Universal machines. Owing to its small size, it is 
quickly handled, and is therefore a favorite for tool- 
room work. 

An overhanging arm is provided for the better sup- over= 
port of the outer end of the cutter arbor. In case an han s in s 
end mill is used, or where the character of the work 
does not require the overhanging arm, it is easily turned 
up out of the way. The end of the arbor, which is cutter 
made cylindrical and ground after hardening, has its Arbor - 
support in the phosphor bronze bearing secured in the Bearing in 
overhanging arm. The bearing is so constructed to 0ver= 
admit of being concentrically closed in as wear takes Arm. 
place. This feature is of no secondary importance, as 
by means of this improved bearing a close adjustment 
on end of arbor is obtained, firmly supporting it and 
permitting therefore heavy and accurate work to be 
done. 



THE CINCINNA TI MILLING MA CHINE CO. 




13'..., 



FIG. 2. 



THE CINCINNATI MILLING MACHINE CO. 



Two friction pulleys are furnished on countershaft, Counter- 
both running in same direction and at different speeds, p„n* 
giving double the usual number of spindle speeds. All 
spindles revolve in a right hand direction, permitting 
the use of turret machine, lathe and drill press tools. 
The double speed countershaft affords two speeds for 
the cutter without shifting the belt on cone pulley or 
changing the gearing, thus giving a roughing cut at 
one speed and a light finishing cut at a higher speed, 
very often a convenience to the operator. 

The main spindle is made of crucible steel and has a spindle. 
|4" h°l e bored through its entire length ; the front end 
is bored to receive a No. 10 B. & S. taper shank on 
cutter arbors. The end of spindle is threaded for re- 
ceiving the 6 inch universal chuck. The thread on the 
front end of the spindle is protected when not in use 
by a guard-collar. 

The 6-inch universal chuck furnished is also made to Universal 
fit the spindle of universal indexing and dividing head. uc 
Besides the numerous uses on the dividing head, it may 
be used on the main spindle of machine for holding 
straight shank reamers, drills, special milling cutters 
and boring bars, as w 7 ell as for cutting up stock from 
the bar passed through the hollow spindle. 

The front box for spindle is solid and has a taper Front Box 
seat in the column. It is made of cast-iron and is lined 
with genuine Babbitt metal, thoroughly compressed 
and secured. The superiority of such a bearing is well 
recognized. Both front and back bearings are provided 
with lock nuts for taking up wear. 

The back bearing is made of phosphor bronze, turned Back Box. 
to fit a taper bored seat in the column. 

The taking up of the end wear of main spindle is Taking up 
provided for in the construction of the front box S 2 , Boxes° f 
Fig. i ; on the rear end of this box is a threaded lock 
collar S 3 , wdiich may be screwed back against the hub 
of the cone pulley as wear takes place. 



THE CINCINNATI MILLING MACHINE CO. 



Oiling of The two spindle boxes are oiled through a wick from 
a reservoir or chamber surrounding each journal, afford- 
ing at all times ample lubrication. 

Column. The main frame or column A, Fig. i, is of box form 

Knee, with its face side planed to receive the knee F, which 

slides vertically upon it and is raised and lowered by 

vertical the screw G. Screw G is operated by a pinion shaft 

screw, ^/hjck j ias on ^ ou t er enc [ a detachable clutch handle 
13, Fig. 2, conveniently located for the workman. 

Saddle. On top of the knee F, Figs. 1 and 2, the saddle H is 
placed. It is operated by the transverse feed screw 1 , 
Fig. 1, in a line parallel to the axis of main spindle. 

Swivel The swivel carriage J, is placed on top of saddle. 

amage. j^ g j ar g e b ear i n g on the saddle provides a substantial 
support for the table K, at whatever angle the table 
ma}^ be placed. The swivel carriage is circular in 
form. This feature is of special value when cutting 
spirals or any work requiring the setting of the table 
to an3 r considerable angle. The angular positions of 
the table are indicated by easily read graduations. 
Clamping The swivel carriage is firmly clamped to the saddle 

a a "j ge by means of T-head bolts, which engage in a circular 

saddle. T-slot in swivel carriage. These bolts extend through 
the saddle and the nuts for tightening are easily ac- 
cessible. 
Oil The table has oil-channels along both sides which 

drain all oil drippings to the pockets at its ends. 
These oil -pockets are provided with plugs for draining 
the oil. 



Channels. 



Table The power for driving the table is obtained from the 

Feed. "*" 

four step cone pulle} T on the rear end of the main 
spindle B. For the slower feeds, this pulley is clutched 
directly to the spindle, and for the faster feeds, runs 
loose on the spindle. While loose on the spindle, the 
cone pulley is driven by a gear arrangement which 
increases the rate of feed between two and three times. 
For this heavier duty of rapid feeding, a higher belt 
speed is obtained. 



THE < 7M 7\.\ . I II MILLING M I < /// WE i '< >. 



Feed 

Mechan= 

ism. 



By the one operation of raising' handlever ze> 8 , these 
gears are thrown out, and at the same time, the clutch 
on the cone pulley W, is engaged with the clutch w 4 
on end of spindle, or vice versa. 

There are eight changes of feed, varying from .004" Feed 
to .070" travel of the table to one revolution of the an ^ es - 
cutter spindle. A dial on the guard for the feed 
mechanism indicates in plain figures the rate at which 
the machine is feeding. 

The arm X, which carries the lower feed cone Y, can Feed Beit. 
be conveniently adjusted on the column to keep the feed 
belt (which may be made endless), at a proper tension. 

Motion is transmitted from cone Y, by means of the 
universal, jointed, telescope shaft to the stem gear b, 
Fig. 2, which has its bearing in the back of the knee 
F ; thence, to the splined shaft /, Figs. 1 and 2. 

The direction of the power feeds is changed by 
operating the tumbler gears through the crank k, 
Fig. 1. These tumbler gears control the direction of 
rotation of shaft /. 

The automatic operation of the cross feed is as follows. 
The splined shaft /, Fig. 2, has a clutch k 1 , pinned to 
its outer end for engaging with another clutch g 1 , 
attached to a pinion/ 1 . 

The automatic cross feed is thrown in or out by 
means of hand-lever M 1 , Fig. 2, engaging or disengaging 
clutch h 1 . This feed may be thrown out automatic- 
ally by means of trip-dogs which act on pitman 24, 
Fig. 2 , to disengage h l . 

The cross-feed screws I, receives its power feed from 
the pinion/ 1 , by its attached gear d l , Fig. 2. A 
clutch-handle 15, Fig. 2, on end of cross-feed screw, 
mounted loosely on it, is shifted into engagement for 
operating this feed by hand. 

The motion for feeding the table is taken from the 
same splined shaft /, Fig. 1, which has upon it a sliding 
bevel gear M, engaging into its companion on a vertical 
shaft, on the upper end of which is formed a spur 



Power 
Cross- 
feed. 



Power 
Table= 
feed. 



THE CINCINNATI MILLING MACHINE CO. 



pinion q. Gear q engages with the large gear r on 
shaft s, centrally located within the carriage J. On 
the upper end of this shaft is a bevel gear meshing 
with gear U 1 . Gear IT 1 is journaled in the carriage 
and has clutch teeth for engaging a feathered clutch U, 
Fig. 2, sliding on the feed screw L, and operating it. 
The hand lever b 1 , engages and disengages clutch U, 
for starting and stopping the automatic table feed. 
Dog In the T-slot on the front side of the table is an ad- 

on Table. j ust able feed tripping dog, 10. This dog has two 
wedge surfaces, either of which as it approaches the 
stud ii on the lever b 1 swings the lever b 1 which 
disengages the feather clutch U, and instantly stops 
the table-feed. 
Back Back-lash in the table feed screw is overcome by the 

Lash, use of a compensating nut. 

Handles There is a handle provided on each end of the table 

on Table. for f ee ding it by hand. The handle 12, Fig. 2, on left 

end of table, is used for fine feeding, the other 13 1 , 

Fig. 2, on right end is used for rapid feeding and also 

for a quick return of the table. 

Elevating The shaft M for vertical motion is placed at an oblique 

Shaft, angle, and carries a clutch crank 13. This arrange- 
ment of shaft in connection with permanent handles on 
screws for cross and longitudinal adjustments of table, 
gives the operator easy control of every adjustment 
without the necessity of changing his position or shift- 
ing the handles. 

Adjust= Two adjustments may be made simultaneous!}'. All 
adjustments are indicated in the thousandths of an inch 
by large readable dials, 20, 21, 22, Fig. 2. 



THE CINCINNATI Ml 1.1. IXC MACHINE CO. 



UNIVERSAL INDEXING AND DIVIDING HEAD. 



Change 
Gears. 



Lead. 



The Universal Indexing and Dividing Head is used Use 
for cutting spiral work such as twist drills, spiral teeth 
on cylindrical and conical milling cutters, and teeth in 
spiral gear wheels, etc. It is used to the greatest ex- 
tent for indexing and dividing the periphery of cylin- 
drical work into a large range of a number of equal 
divisions. 

When cutting spirals, suitable gears are attached 
from the lead screw to the dividing head. These gears 
are mounted on the segment plate Q, Fig. 3. When 
the table is driven by its lead screw, these gears pro- 
duce rotation of the dividing head spindle. 

On most spiral w T ork, for every revolution of the 
dividing head spindle, the table travels more than one 
inch. Therefore, instead of designating the spiral by 
its pitch, the lead is given in inches, which means that 
the table has traveled a certain number of inches (called 
lead) while the dividing head spindle has made one 
revolution. For example, a 6-inch lead is one in 
which the dividing head spindle makes one turn in 6 
inches travel of the table. The manner of determining 
the gears for various spirals is explained under the head 
of Change Gears for Cutting Spirals, in this treatise. 

Fig. 3 shows the various parts of the head. The 
housing E rests on the table of the milling machine, 
and has two feathers which fit in the T-slot of the 
table and two slotted holes in its base for receiving two 
clamping bolts. 

The swiveling block carrying the spindle S, is fitted s W j V eiing 
in the housing E. This block is always fully contained 
within its bearings at whatever angle the spindle is 
held. 



Housing. 



Block. 



THE CINCINNA TI MILLIXG MA CHIXE CO. 




/Zitrn in 70 /fa inc/z- 



FIG. 3. 



THE ( V.\ t INh , I 11 Mll.l.l.\ (1 M. I ( III VE ( ( >. 



A circular T-slot, similar to that of a planer head, is 
turned in one side of the swiveling block. This slot is 
concealed, and can not become clogged with chips. By 
means of two T-bolts in this slot and an additional 
clamping device B, on the other side, the swiveling 
block is firmly held at any desired angle. The end of 
the spindle is not raised to an excessive height when it 
is in a vertical position, because the axis of the swivel- 
ing block is central with the housing. The swiveling 
block is as rigid when the spindle is vertical as in any 
other position. 

The same arbors which fit the main spindle of the spindles. 
milling machine will fit the spindle S. The spindle S 
will take work through its entire length i T y diameter. 
The front end of the spindle is threaded to receive a 
6-inch universal chuck. When not in use, the thread 
on the spindle is protected by a guard-collar. 

The chuck fitting this spindle also fits the main chuck. 
spindle of the machine. The spindle of the head is 
provided with a clamping device U, by means of which clamping 
it can be firmly locked during cutting operations, thus s P' nd,e - 
relieving the worm, worm wheel and index pointer of 
all strain. 

On the spindle, there is formed a worm gear having 
40 teeth. For dividing work into a number of equal 
parts, the side index plate P 1 , and index pointer N, are i n d ex = 
provided. A complete description of the method of plate and 
making divisions is given in the article on the use of pointer, 
the sector, page 18. 

The sector is shown at V, Fig. 3, and more plainfy s ec tor. 
in Fig. 4. 

To cut left hand spirals on the Nos. 1, ij4 and 2 
Universal Machines, and right hand spirals on the No. 
3 Universal Machine, the idle gear C is meshed between Direction 
the change gears by shifting the holder A. This of spiral. 
holder is marked for each machine, with the direction 
of the spiral which can be cut when the idle gear C is 
jn mesh. 



iS 



THE CIXCINNATI MILL IX G MACHINE CO. 




38 Circle /OJ^o/e.y. 



FIG. 4. 



SECTOR. 



Fig. 4 shows how the sector is adjusted for counting 
off holes in the index-plate. This example shows the 
sector in position to cut 152 teeth which requires that 
the index pointer move over a series of 10 holes for 
each division. Mistakes are frequently made in setting 
the sector only 10 holes apart, which is incorrect. The 
hole in which the index-pointer rests, which is indi- 
cated by black spot, should never be counted when 
adjusting the sector for any number of holes. After 
the sector is set and tightened by the screw a, no 
further counting of holes is necessary in cutting the 
w T heel of 152 teeth, because the sector as set is moved 
against the index pointer for each division. 



THE CINCINNATI MILLING MACHINE CO. 



The index-plate is drilled from both sides, the circles 
t8j 24, 2$, 30, 34, 37, 38, 39 and 41, being drilled in 
one side and circles 42, 43, 46, 47, 49, 54, 58, 62 and 
66 in the other. 

With these circles, the greatest possible variety of 
divisions up to 360 is obtained as shown in table in 
the latter part of this book. 

The following rule may be applied for finding the Rule. 
number of turns or number of holes required to divide 
the periphery of cylindrical work into any given number 
of equal parts. 

Forty revolutions of the index-pointer holder P, Fig. 
3, are required to make one revolution of the dividing 
head spindle ; therefore, to make an} 7 part of a revo- 
lution of the spindle, 40 divided by the number of 
divisions required, will determine the number of turns 
or part of a turn to be made by the index pointer. 

For example, suppose it is required to cut 96 teeth ; 
then 40 divided by 96 is equal to ff ; according to the 
index chart furnished with each dividing head, this 
division can be made by using the 24 hole circle ; since 
■ff is equal to ^i, the index pointer must make 4-J of a 
turn or be moved 10 holes in the 24 hole circle for each 
division. 

We are prepared to furnish index plates to make the 
special divisions shown on page 20, in addition to those 
which are shown on our regular table. On account of 
the greater number of holes in these plates, the holes 
must be drilled smaller than in the regular plate, and 
an index-pointer of smaller diameter is also required. 



THE CINCINNATI MILLING MACHINE CO. 



SPECIAL DIVISIONS. 



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302 


151 


20 


604 


151 


10 


1208 


151 


5 


153 


153 


40 


306 


153 


20 


612 


153 


10 


1224 


153 


5 


157 


157 


40 


314 


157 


20 


628 


157 


10 


1256 


157 


5 


159 


159 


40 


318 


159 


20 


636 


159 


10 


1272 


159 


5 


161 


161 


40 


322 


161 


20 


644 


161 


10 


1288 


161 


5 


163 


163 


40 


326 


163 


20 


652 


163 


10 


1304 


163 


5 


167 


167 


40 


334 


167 


20 


668 


167 


10 


1336 


167 


5 


169 


169 


40 


338 


169 


20 


676 


169 


10 


1352 


169 


5 


171 


171 


40 


342 


171 


20 


684 


171 


10 


1368 


171 


5 


173 


173 


40 


346 


173 


20 


692 


173 


10 


1384 


173 


5 


175 


175 


40 


350 


175 


20 


700 


175 


10 


1400 


175 


5 


177 


177 


40 


354 


177 


20 


508 


177 


10 


1416 


177 


5 


179 


179 


40 


358 


179 


20 


716 


179 


10 


1432 


179 


5 


181 


181 


40 


362 


181 


20 


724 


181 


10 


1448 


181 


5 


183 


183 


40 


366 


183 


20 


732 


183 


10 


1464 


183 


5 


187 


187 


40 


374 


187 


20 


748 


187 


10 


1496 


187 


5 


189 


189 


40 


378 


189 


20 


756 


189 


10 


1512 


189 


5 


191 


191 


40 


382 


191 


20 


764 


191 


10 


1528 


191 


5 


193 


193 


40 


386 


193 


20 


772 


193 


10 


1544 


193 


5 


197 


197 


40 


394 


197 


20 


788 


197 


10 


1576 


197 


5 


199 


199 


40 


398 


199 


20 


796 


199 


10 


1592 


199 


5 



THE ( '/.Y< 7 \ Y / II MILLING M I ( III \ I C( ». 




FIG 



TAIL STOCK. 



Fig. 5 illustrates the tail-stock. The housing is shown 
at D. The slide E is dove- tailed into the housing and 
is moved forward and backward by turning the knob A. 
The clamping bolt C holds the slide E firmly in any 
position. The double center-bar F in tail-stock is dove- 
tailed into the front of the slide E. This center-bar is 
adjustable up and down by means of a rack and pinion 
operated by the knob B. The clamping bolt G, holds 
the center-bar firmly in any position. 

One center has the top milled off to allow small work, 

such as taps, reamers, etc., 
to be milled ; the other end 
is left as full as possible for 
milling heavy work with 
large centers. 

The change from one end 
of the center-bar to the other 
is easily and quickly made. 

Fig. 6 shows a special tail- 
stock center-bar. One end 
A is milled off on the side 
as well as on the top. This 
permits the use of an end 
mill very close to the center. 
The other end of this center- 
bar is provided with a female 
>" I center B. 




Housing. 
Slide. 



Clamping 

Bolt for 

Slide. 

Center- 
bar. 
Clamping 
Bolt for 
Center= 
bar 

Small 
Center. 

Large 
Center. 





m 






mm 





Special 
Centers. 



FIG. 6. 



THE CINCINNA TI MILLING MACHINE CO. 




THE CINCINNATI MILLING MACHINE CO. 



SPINDLE FOR BACK-GEARED MACHINES. 

Fig. 7 shows the method of fastening the face-gear 
F. with its collar H, to the spindle by means of the 
notched feather C and spline in the spindle D. 

The knurled knob L is used for connecting and dis- 
connecting the face-gear F and the driving cone E. 
When the back-gear is not required, the face-gear and 
driving cone run together. To accomplish this, the 
knurled knob L is turned to the left, and by turning 
the driving pulley belt by hand, the driving stud J is 
pushed into one of the holes in the driving cone head 
K, by the spring M. 

For disconnecting the face-gear from the cone, the 
driving stud J is withdrawn by turning the knurled 
knob L to the right, and the back-gear can then be 
thrown in. This knob avoids the use of a wrench, and 
enables the operator to make these changes without 
the necessity of feeling his way. 

To Adjust the Spindle. — For taking up the wear 
on the taper of the spindle, and to take out end play, 
turn the lock-nut G toward the face-gear F. 

After a number of adjustments of the spindle, the 
driving cone may become crowded against the back 
box. To move the cone forward, the notched feather 
C is withdrawn by turning screw B until it comes to 
a stop. Turn the lock-nut G away from the face- 
gear. Then move the face-gear and driving cone to- 
ward the nut G. Screw down the notched feather C, 
which will now 7 engage in other teeth in the notched 
spline nearer the front of the spindle. 

To TAKE THE MILLING MACHINE SPINDLE D Ollt of 

its bearings, insert wrench A through the largest step 
of the cone pulley into screw B, and withdraw feather C, 
until it comes to a stop, and after unfastening the gear 
on back end of spindle the spindle may be withdrawn. 
The Cone Pulley E should have about ^V of an 
inch lateral play after the spindle is adjusted. 



THE CINCINNA TI MILLIXG MA CHLXE CO. 




FIG. 8. 



SECTION OF FRONT BOX. 



Fig. 8 shows a section of the front cast iron box, with its 
Babbitt lining. After the box has been bored, dove- tail slots 
are planed lengthwise in it. Two dove-tail circular grooves 
are turned in it to keep the Babbitt metal from shifting length- 
wise. The Babbitt metal is thoroughly compressed by a rolling 
process, then turned out true, and treated as though it were 
a solid box. 

Babbit lined bearings have been used for many 3-ears on 
lathes, screw machines, and other fine and accurate machinery, 
and better results have been obtained from its use than from 
any other material. 



THE CINCINNATI MILLING MACHINE CO. 



GEAR-BOX. 



All back-geared machines are made with a gear-box, 
providing a stronger and wider range of feeds for the 
heavier duty resulting from the use of cutters of larger 
diameters and wider faces, which may be used, owing 
to the increased range of spindle speeds. 

Figs. 9 and 10 show the construction of the gear-box. 
A small and large pinion O and P, are secured on the 
rear end of the milling machine spindle B, which pro- 
jects beyond the column. Pinions R and S, which 
mesh either with or P, are fastened to shaft Q. 

The gears T, U, V and shaft Q drive the cone pulley, 
W. From this pulley, power is transmitted to uni- 
versal-jointed telescope shaft in the same manner as 
described on page 13. 

On top of the gear-box is fastened a plate, I 3 , show- 
ing the rate of feed in thousandths of an inch to one 
revolution of the main spindle. 

The gears T and V are change gears, which may be 
transposed for slower or faster feeds. Twelve distinct 
changes in the rate of feed are obtained by the use of 
the cone pulleys, sliding gear and change gears. The 
gear, U, is an intermediate gear running loose on an 
eccentric bushing. No fine adjustment of the inter- 
mediate gear is necessary in transposing gears T and 
Y, because the eccentric bushing is simply turned one- 
half revolution to bring the gears into proper mesh. 
The dial plate, I 3 , and the pointer, H 3 , are shown 
below. 

The rate of feeds is read from the plate as follows. 
When the small gear V is on the upper shaft Q, and 
the belt is on the smallest step of the cone pulley, W, 
the left hand figure in the upper row, on the side to 



THE CINCINNA TI MILLING MA CHINE CO. 



which the pointer directs, should be read ; if the belt 
is on the second step of the cone pulley, W, the second 
figure, and if on the third step, the third figure in the 
upper row is read. When the large gear, T, is on 
shaft, Q, the lower row of figures is read in the same 
manner. 

For example, when the feed belt is running on the 
small step of the pulley, W, and the pointer, I 3 , points 
to the left, this would indicate that the feed advances 
yo'W of an inch to every revolution of the milling 
cutter. Throwing the lever to the left, thereby shift- 
ing the sliding gear inside the box, and changing the 
direction of the pointer to the right, the rate of feed 
indicated will be t Mtt of an inch. 



10 (TO" 

By placing the belt on the second step of the cone 
pulley, the second number, 9 is read, and by throwing 
the lever over, the pointer indicates T |f ^ of an inch 
feed to every revolution of the spindle. 

This rapid change in the rate of feed by simply 
throwing the lever, G 3 , from one side to the other is 
quite an advantage because coarse and fine feeds can be 
applied on some work for roughing and finishing cuts 
without rechucking the piece. 



Feed in Thousandths io one 
Revolution of Spindfe. 



O 



9 12 16 22 



41 57 \78 98 i 146 187 





THE CINCINNATI MILLING MACHINE CO. 



MILL.MACH SPINDLE. 




FIG. 10. 



lS 



THE CINCINNATI MILLING MACHINE CO. 



Table Feed, . 20 in. 
Cross " . 6 in. 
Vertical " .17 in. 




No. \ Universal Milling Machine. 



FIG. 11. 



THE CINCINNATI MILLING MACHINE CO. 



No. 1 UNIVERSAL. 



The No. i Universal is well adapted for the tool-room. Its size per- 
mits a rapid adjustment of the machine for the great variety of work 
usually performed there. 

The Spindle is bored to receive a No. 10 B. & S. taper shank on 
cutter arbors and collets. From this taper bore, a hole -Jf" diameter 
is drilled through the remaining length of the spindle. The front end of 
the spindle is threaded and is provided with a guard-collar. 

The Driving Cone has four steps for a 3" belt. The largest 
diameter is 12 inches. 

The Overhanging Arm is 3^ " diameter. It can be turned up 
out of the way or put in from the rear of the machine to receive various 
attachments. It is provided with an adjustable phosphor bronze bushing 
to support the cylindrical end of the arbor. The distance from center of 
spindle to overhanging arm is 6*4 inches. 

The Table over all including oil pockets is 35" x6>^ // . The work- 
ing surface is 33" x 6^ r/ . There is one T-slot y%" wide. The top of the 
table can be lowered 17" below the center of the spindle. 

The Swivel Carriage which forms the housing for the table is 
graduated in degrees on its circular face. A T-slot is turned in the 
bottom, near the outer edge, to receive two T-bolts which pass down 
through the saddle and are used for firmly clamping the swivel carriage 
to the saddle. 

The Feed of the table is automatic in either direction through 20^. 
The cross motion in line with the spindle is 6 /r , and is automatic imeither 
direction. Both of the above feeds are reversed by a lever on the front 
of the machine, without crossing the feed belt There are 8 changes of 
feed which vary from .004" to 070" travel of the table to one revolution 
of the cutter spindle. All feed adjustments are indicated by dials in 
thousandths of an inch. 

The Index Cutters furnished with this machine swing io // diameter 
and take in length 15 inches. 

The Vise can be swiveled to any position, the angle of which is 
shown on the graduated base. The jaws are 6" wide, i^rV' deep, and 
will open 3^ // . 

The Countershaft has two 12 inch friction pulleys for 3" belts, 
which should run at 80 and no revolutions per minute. 

The Floor Space necessary to permit the extreme limits of travel 
is 69 x 58 inches. 

Net Weight of machine is 1900 pounds. 



THE CINCINNA TI MILLING MA CHINE CO. 



Table Feed, . 20 in. 
Cross " . 6 in. 
Vertical " . 17 in. 




No. \y 2 Universal Milling Machine, 



FIG. 12. 



THE CINCINNATI MILLING MACHINE CO 



No. VA UNIVERSAL. 



The No. i l 2 Universal Milling Machine closely resembles the No. i 
Universal. It is provided, however, with back-gearing and the feed gear- 
box described on page 25. 

This machine is well adapted for tool-room work where more spindle 
power and a larger range of spindle speeds is required. 

The Spindle is bored to receive a Xo. 10 B. & S. taper shank on 
cutter arbors and collets. From this taper bore, a hole || // diameter is 
drilled through the remaining length of the spindle. The front end of 
the spindle is threaded and is provided with a guard-collar. 

The Driving Cone has four steps for a 2 X / Z // belt. The largest 
diameter is 10 inches. 

The Overhanging Arm is iK" diameter and can be turned up out 
of the way or put in from the rear of the machine to receive various 
attachments. It is provided with an adjustable phosphor bronze bushing 
to support the cylindrical end of the arbor. The distance from center of 
spindle to overhanging arm is 6 1 /. inches. 

The Table over all including oil pockets is 35" x 6 l / 2 n '. The work- 
ing surface is 33" x 6)4 // . There is one T-slot y% ,f wide. The top of the 
table can be*lowered iy // below the center of the spindle. 

The Swivel Carriage which forms the housing for the table is 
graduated in degrees on its circular face. A T-slot is turned in the 
bottom, near the outer edge, to receive two T-bolts which pass down 
through the saddle and are used for firmly clamping the swivel carriage 
to the saddle. 

The Feed of the table is automatic in either direction through 20". 
The cross motion in line with the spindle is 6 /7 , and is automatic in either 
direction. Both of the above feeds are reversed by a lever on the front 
of the machine, without crossing the feed belt. There are 12 changes of 
feed which vary from .oo6 // to .150" travel of the table to one revolution 
of the cutter spindle. All feed adjustments are indicated by dials in 
thousandths of an inch. 

The Index Centers furnished with this machine will swing io // 
diameter and take in length 15 inches. 

The Vise can be swiveled to any angle, where its position is shown 
by the graduated base. The jaws are 6 // wide, ijV' deep, and will 
open $%". 

The Countershaft has two 12 inch friction pulleys for 3" belts, 
which should run at 90 and 150 revolutions per minute. 

The Floor Space necessary to permit the extreme limits of travel 
is 69 x 58 inches. 

Net Weight is 1980 pounds. 



32 



THE CINCINNATI MILLING MACHINE CO. 



Table Feed, . 23 in. 
Cross " . Q)4 in. 
Vertical " . 18 >£ in. 




No* 2 Universal Milling Machine. 



FIG. 13. 



THE CINCINNATI MILLING MACHINE CO. 33 



No. 2 UNIVERSAL. 



The No. 2 Universal is adapted for tool-room work and can be placed 
to good advantage in jobbing shops. It is heavier than the Nos. i and 
and i ';> Universal and has a larger range throughout. This machine is 
back-geared. 

The Spindle is bored to receive a No. io B. & S. taper shank on 
cutter arbors and collets. From this taper bore, a hole || // diameter is 
drilled through the remaining length of the spindle. The front end of 
the spindle is threaded and is provided with a guard-collar. 

The Driving Cone has four steps for a i% /f belt. The largest 
diameter is io inches. 

The Overhanging Arm is 4" diameter. It can be turned up out 
of the way or put in from the rear of the machine to receive various 
attachments. It is provided with an adjustable phosphor bronze bushing 
to support the cylindrical end of the arbor. The distance from center of 
spindle to overhanging arm is 5^ inches. 

The Table over all including oil pockets is 38" x 8^ // . The work- 
ing surface is 35" x $>/%". There are two T-slots yi" wide. The top of 
the table can be lowered i8^ 7/ below the center of the spindle. 

The Swivel Carriage which forms the housing for the table is 
graduated in degrees on its circular face. A T-slot is turned in the 
bottom for one of the T-head clamping bolts. 

The Saddle has a T-slot turned in its upper face which, in con- 
nection with the T-slot in the swivel carriage, permits the use of four 
strong bolts for firmly clamping the swivel carriage and saddle together. 

The Feed of the table is automatic in either direction through 23". 
The cross motion in line with the spindle is 6 l / 2 // , and is automatic in 
either direction. Both of the above feeds are reversed by a lever on the 
front of the machine, without crossing the feed belt. There are 12 
changes of feed which vary from .006 " to . 150" travel of the table to one 
revolution of the cutter spindle. All feed adjustments are indicated by 
dials in thousandths of an inch An automatic vertical feed can be fur- 
nished with this machine to order. 

The Index Centers swing io // diameter and take in length 17 inches. 

The Vise can be swiveled to any position, the angle of which is 
shown by the graduated base. The jaws are 6" wide, 1 r 7 6 // deep, and 
will open 3K 7/ - 

The Countershaft has two 12 inch friction pulleys for 3^" belts, 
which should run at 90 and 150 revolutions per minute. 

The Floor Space necessary to permit the extreme limits of travel 
is 82x68 inches. 

Net Weight is 2125 pounds. 



THE CINCINNA TI MILLING MA CHINE CO. 



Table Feed, . 28 in. 
Cross " . 7^ in. 
Vertical " . 19 in. 




No- 3 Universal Milling Machine, 



FIG. 14. 



/"///■- CINCINNATI MILLING MACHINE CO. 



No. 3 UNIVERSAL. 



The Xo. 3 Universal is much heavier and is more powerful than the 
smaller sizes. It is intended for a heavier class of tool-room work and is 
very useful for general manufacturing purposes where a Universal Machine 
is required. This machine is back-geared. 

The Spindle is bored to receive a No. n B. & S. taper shank on 
cutter arbors and collets. From this taper bore, a hole {§" diameter is 
drilled through the remaining length of the spindle. The front end of 
the spindle is threaded and is provided with a guard-collar. 

The Driving Cone has four steps for a 3" belt. The largest 
diameter is 1 1 % inches. 

The Overhanging Arm is 4^ 7/ diameter and can be turned up out 
of the way or put in from the rear of the machine to receive various 
attachments. It is provided with an adjustable phosphor bronze bushing 
to support the cylindrical end of the arbor. The distance from center of 
spindle to overhanging arm is 6 r T g inches. 

The Table over all including oil pockets is 46" x ^Yz n ' . The work- 
ing surface is 43 // x9>£ // . There are 3 T-slots y%" wide. The top of 
the table can be lowered 19" below the center of the spindle. 

The Swivel Carriage which forms the housing for the table is 
graduated in degrees on its circular face. A T-slot is turned in the 
bottom for one of the T-head clamping bolts. 

The Saddle has a T-slot turned in its upper face which, in con- 
nection with the T-slot in the swivel carriage, permits the use of four 
strong bolts for firmly clamping the swivel carriage and saddle together. 

The Feed of the table is automatic in either direction through 28". 
The cross motion in line with the spindle is'j}4 // and is automatic in either 
direction. Both of the above feeds are reversed by a lever on the front 
of the machine, without crossing the feed belt. There are 12 changes of 
feed which vary from .oo6 // to .150" travel of the table to one revolution 
of the cutter spindle. All feed adjustments are indicated by dials in 
thousandths of an inch. An automatic vertical feed can be furnished 
with this machine to order. 

The Index Centers furnished with this machine swing i2 // diameter 
and take in length 21 inches. 

The Vise can be sw T iveled to any position, the angle of which is 
shown by the graduated base. The jaws are 7" wide, i T % // deep, and 
will open <\%". 

The Countershaft has two 12-inch friction pulleys for y/ z n belts, 
which should run at 90 and 150 revolutions per minute. 

The Floor Space necessary to permit the extreme limits of travel 
is 98^ // x72 // . 

Net Weight is 2800 pounds. 



36 



THE CLXCINXA TI MILLING MA CHLXE CO. 



GENERAL DIMENSIONS. 



UNIVERSAL MILLING MACHINES. 



Net weight 

Shipping weight about 

Length of automatic feed to table 

Cross motion in line with spindle 

Vertical range 

Size of table over all 

Working surface of table 

Largest diameter of driving pulley 

Number of steps on driving pullej^ 

Number of spindle speeds 

Width of driving belt 

Number of feed changes 

Variations in feed to 1 rev. of spindle. . 

Width of feed belt 

Center of spindle to overhanging arm. . 

Diameter of overhanging arm 

Back-geared 

No. of vise furnished 

No. of B. & S. taper hole in spindle 

Diameter of hole in spindle 

Speeds of countershaft 

Size of countershaft pulleys 

Floor space 

Dimensions of box for export 

Index centers swing 

Index centers take in length 



Page 28 


Page 30 


Page 32 


Page 34 


No. 1. 


No. iy 2 . 


No. 3. 


No 3. 


1900 lbs. 


1980 lbs. 


2100 lbs. 


2800 lbs. 


2400 lbs. 


2500 lbs. 


2700 lbs. 


3400 lbs. 


20" 


20" 


■ 23" 


28" 


6" 


6" 


6%" 


7%" 


17" 


17" 


isy 2 " 


19" 


85x6%" 


35x6%" 


38x8%" 


46x9%" 


33x6%" 


33x6%" 


35x8%" 


43x9%" 


12" 


10" 


10" 


n%" 


4 


4 


4 


4 


8 


16 


16 


16 


3" 


2%" 


2%" 


3" 


8 


12 


12 


12 


.004 to .070 


.006 to .150 


.006 to .150 


,C06to.l50 


IK" 


i%" 


i%" 


1%" 


6K" 


6K" 


5rs" 


6 tV 


3K" 


3K" 


4" 


4%" 


No. 


Yes. 


Yes. 


Yes. 


1 Swiv. 


1 Swiv. 


1 Swiv. 


2 Swiv. 


10 


10 


10 


11 


1 3 
T6 


13 
T6 


13 

Te- 


1 3 
16 


80 & 150 


90 & 150 


go & 150 


90 & 150 


3x12" 


3x12" 


3%xl2" 


3%xl2" 


69x58" 


69x58" 


82x68" 


98%x72" 


56x37x62 


56x37x62 


63x46x62 


66x50x66 


10" 


10" 


10" 


12" 


15" 


15" 


17" 


21" 



THE CINCINNATI MILLING MACHINE CO. 37 



PLAIN MILLING MACHINES. 



The Plain Machines are built the same in size as the Universal 
Machines of corresponding numbers. They have all the move- 
ments of Universal Machines, with the exception that the table 
of a Plain Machine has no swivel movement, which is neces- 
sary in cutting spirals. 

It is often thought that the swiveling of the table produces 
angular work, such as long key-shaped pieces or similar work. 
This, of course, is a mistaken idea. 

The Plain Machines are simpler in construction and are built 
for more severe and heavier duty than the Universal Machines. 

The table is fitted directly into the saddle which slides on the 
knee, and is larger on the Plain than on the Universal Machine. 

All Plain Machines, except No. o, are furnished with strong 
braces combining the knee and the overhanging arm very 
rigidly. These can be taken off very quickly when not required, 
by unscrewing the nut on the outer end of stud and releasing 
the clamp screw on the bridle which straddles the knee. 

A number of these machines can be operated at the same time 
by a workman of limited skill, as the operations are usually 
very simple on work produced in large quantities. 

Owing to their simplicity and greater capacity for turning 
out work, this type of machines is to be preferred for manufac- 
turing purposes, and is best adapted for the majority of shops. 
In connection with the universal head and other attachments, 
every operation, except cutting of spirals, worm wheels or any 
other work requiring the swivel movement of the table, can be 
performed on these machines. 



38 



THE CINCINNA TI MILLING MA CHIXE CO. 



Table Feed, . 18 in. 
Cross " . 5^ in. 

Vertical " . 14 in. 




No. Plain Milling Machine. 



FIG. 15. 



THE i 7.\ "( 7.V.V. / 77 MILLING M. I ( IIIM- ( '( >. 39 



No. PLAIN. 



This machine is well adaped for light rapid milling, such as the 
manufacture of bicycle parts, electrical fittings and appliances, type- 
writers, etc. 

The Spindle is bored to receive a Xo. 9 B. & S. taper shank on cutter 
arbors and collets. From this taper bore, a hole \\" diameter is drilled 
through the remaining length of the spindle. The front end of the 
spindle is threaded and is provided with a guard-collar. 

The Driving Cone has four steps for a 2^" belt. The largest 
diameter is 10 inches. 

The Overhanging Arm is i%" diameter. It can be turned up out 
of the way, or it can be put in from the rear of the machine to receive 
various attachments. It is provided with an adjustable phosphor bronze 
bushing to support the cylindrical end of the arbor. The distance from 
center of spindle to overhanging arm is 5^ inches. 

The Table over all including oil pockets is 32>< // x 8". The working 
surface is 27^ // x8 // . There are 3 T-slots ~y%" wide. The top of the 
table can be lowered 14" below the center of the spindle. 

The Feed of the table is automatic in either direction through i8 // . 
This feed is reversed by a lever on the front of the machine, without 
crossing the feed belt. The cross motion in line with the spindle is 5%". 
There are 8 changes of feed which vary from .005" to ,ioo // travel of the 
table to one revolution of the cutter spindle. All feed adjustments are 
indicated by dials in thousandths of an inch. 

The Vise can be swiveled to any position, the angle of which is 
shown by the graduated base. The jaws are 6" wide, iyV' deep, and will 
open 3 j£". 

The Countershaft has one 12-inch friction pulley for a 3" belt which 
should run at 130 revolutions per minute. 

The Floor Space necessarv to permit the extreme limits of travel 
*"x 5 i". 
Net Weight is 12S0 pounds. 



THE CINCINNA TI MILLING MA CHINE CO. 



Table Feed, . 21 in. 
Cross " . ft in. 

Vertical " . 19 in. 




No* 1 Plain Milling Machine. 



FIG. 16. 



THE ( INI 'INN. I II MILLING M. I ( 7//A I < \ '. 



No. 1 PLAIN. 



The No. i Plain is very convenient in model shops. It is well suited 
for manufacturing small articles, such as gun parts, sewing machine 
parts, etc. 

The Spindle is bored to receive a Xo. 10 B. & S. taper shank on 
cutter arbors and collets. From this taper bore, a hole -j-f " diameter is 
drilled through the remaining length of the spindle. The front end of 
the spindle is threaded and is provided with a guard-collar. 

The Driving Cone has four steps for a 3" belt. The largest diameter 
is 12 inches. 

The Overhanging: Arm is 3^ 7/ diameter. It can be turned up out of 
the way, or it can be put in from the rear of the machine to receive 
various attachments. It is provided with an adjustable phosphor bronze 
bushing to support the cylindrical end of the arbor. The distance from 
center of spindle to overhanging arm is 6% inches. 

The Table over all including oil pockets is 36 // x9 // . The working 
surface is 30" x a/'. There are 3 T-slots y% /f wide. The top of the table 
can be lowered 19" below the center of the spindle. 

The Feed of the table is automatic in either direction through 2\" '. 
This feed is reversed by a lever on the front of the machine, without 
crossing the feed belt. The cross motion in line with the spindle is 6". 
There are 8 changes of feed which vary from .005 " to ioo' 7 travel of the 
table to one revolution of the cutter spindle. All feed adjustments are 
indicated by dials in thousandths of an inch. 

The Vise can be swiveled to any position, the angle of which is 
shown by the graduated base. The jaws are 6'' wide, 1 r 7 g /y deep, and will 
open ^Yz° . 

The Countershaft has two 12-inch friction pulleys for 3'' belts, 
which should run at So and no revolutions per minute. 

The Floor Space necessary to permit the extreme limits of travel is 
76 x 6r inches. 

Net Weight is 1800 pounds. 



THE CINCINNA TI MILLIXG MA CHTXE CO. 



Table Feed, . 24 in. 
Cross ' ' . 1% in. 

Vertical " .19 in. 




No. 2 Plain Milling Machine, 



FIG. 17. 



THE CINCINNATI MILLING MACHINE CO. 



No. 2 PLAIN. 



The No. 2 Plain is, without doubt, the best machine for machine tool 
builders. It takes in a great range of work, and in general jobbing shop 
operations, it has become a very important tool. This machine is back- 
geared. 

The Spindle is bored to receive a No. 10 B. & S. taper shank on 
cutter arbors and collets. From this taper bore, a hole ^f" diameter is 
drilled through the remaining length of the spindle. The front end of 
the spindle is threaded and is provided with a guard-collar. 

The Driving Cone has four steps for a 2S±" belt. The largest 
diameter is 10 inches. 

The Overhanging Arm is \" diameter. It can be turned up out of 
the way or it can be put in from the rear of the machine to receive 
various attachments. It is provided with an adjustable phosphor bronze 
bushing to support the cylindrical end of the arbor. The distance from 
center of spindle to overhanging arm is 5 T 9 g inches. 

The Table over all including oil pockets is 4o^ // xio // . The 
working surface is 34 y%" x io // . There are 3 T-slots ^i // wide. The top 
of the table can be lowered 19" below the center of the spindle. 

The Feed of the table is automatic in either direction through 24". 
This feed is reversed by a lever on the front of the machine, without 
crossing the feed belt. The cross motion in line with the spindle is 7}4 // . 
There are 12 changes of feed which vary from .oo6 // to .187" travel of the 
table to one revolution of the cutter spindle. All feed adjustments are 
indicated by dials in thousandths of an inch. This machine can be 
furnished with automatic cross and vertical feeds to order. 

The Vise can be swiveled to any position the angle of which is shown 
by the graduated base. The jaws are 6" wide, iyV 7 deep, and will 
open 3J£". 

The Countershaft has two 12-inch friction pulleys for a 3 }i^ belt, 
which should run at 90 and 150 revolutions per minute. 

The Floor Space necessary to permit the extreme limits of travel 
is S2' / x6S // . 

Net Weight is 2100 pounds. 



THE CIXCIXXA TI MILLING MA CHIXE CO. 



Table Feed, . 32 in. 
Cross " . 9 in. 

Vertical " . 20 in. 




No* 3 Plain Milling Machine, 



FIG. 18. 



THE CINCINNATI MILLING MACHINE CO. 



No. 3 PLAIN. 



The No. 3 Plain is designed for a heavier class of milling, and is well 
adapted for machine tool builders, engine and railroad shops, and large 
jobbing work. This machine is back-geared. 

The Spindle is bored to receive a No. n B. & S. taper shank on 
cutter arbors and collets. From this taper bore, a hole }| // diameter is 
drilled through the remaining length of the spindle. The front end of 
the spindle is threaded and is provided with a guard-collar. 

The Driving Cone has four steps for a 3" belt. The largest diameter 
is 11 1 : inches. 

The Overhanging Arm is ^% /f diameter. It can be turned up out 
of the way, or it can be put in from the rear of the machine to receive 
various attachments It is provided with an adjxistable phosphor bronze 
bushing to support the cylindrical end of the arbor. The distance from 
center of spindle to overhanging arm is 6 r 7 ff inches. 

The Table over all including oil pockets is 5i 7/ x 12" '. The working 
surface is 45" x 12". There are 3 T-slots Y% n wide. The top of the table 
can be lowered 20'' below the center of the spindle. 

The Feed of the table is automatic in either direction through 32". 
This feed is reversed by a lever on the front of the machine, without 
crossing the feed belt. The cross motion in line with the spindle is 9". 
There are 12 changes of feed which van- from .006" to .i&Y' travel of 
the table to one revolution of the cutter spindle. All feed adjustments 
are indicated by dials in thousandths of an inch. This machine can be 
furnished with automatic cross and vertical feeds to order. 

The Vise is flanged and can be clamped to the table with the jaws 
parallel to the table slots or at right angles to the table slots. The jaws 
are 8" wide, 2^ // deep and will open 6 // . 

The Countershaft has two 12-inch friction pulleys for a 3 j£ /7 belt, 
which should run at 90 and 150 revolutions per minute. 

The Floor Space necessary to permit the extreme limits of travel 
is 9<SK // x72 // . 

Net Weight is 2800 pounds. 



4fi 



THE CINCINNA TI MILLING MA CHINE CO 



Table Feed, . 24 in. 
Cross M . 11 V 2 in. 

Vertical " . 19 in. 




No, 2 Plain Milling Machine, 

Showing- all Automatic Feeds. 



FIG. 19. 



THE CINCINNATI MILLING MACHINE CO 



GENERAL DIMENSIONS* 



PLAIN MILLING MACHINES. 



47 



Page 38 



No. 0. 



Page 40 



No. L 



Net weight 

Shipping weight about 

Length of automatic feed to table 

Cross motion in line with spindle 

Vertical range 

Size of table over all 

Working surface of table 

Largest diameter of driving pulley . . . 

Number of steps on driving pulley 

Number of spindle speeds 

Width of driving belt 

Number of feed changes 

Variations in feed to i rev. of spindle. 

Width of feed belt 

Center of spindle to overhanging arm 

Diameter of overhanging arm 

Back-geared 

No. of vise furnished 

No. of B. & S. taper hole in spindle. . . 

Diameter of hole in spindle 

Speed of countershaft 

Size of countershaft pulleys 

Floor space 

Dimensions of box for export 



1280 lbs. 

1600 lbs. 

IS" 

14" 

32^x8" 

27^x8" 

10" 

4 

4 

2y 2 " 

8 
.005 to .100 

IK" 
5%" 

3K" 

No. 

1 Swiv. 



130 

3x12" 
70x51" 

51x45x57 



1800 lbs. 

2200 lbs. 

21" 

6" 

19" 

36x9" 

30x9" 

12" 

4 

8 

3" 

S 

.005 to .100 

XW' 

6Ks" 

Wx" 

No. 

1 Swiv. 

10 

1 3 
T6 

80 & 150 

3x12" 

76x61" 

58x50x62 



Page 42 ! Page 44 



No. 2. No. 3. 



2100 lbs. 

2500 lbs. 

24" 

19" 
40^x10" 
34^x10" 

10" 
4 

16 

12 

.006 to .1ST 
l%" 

'" re 
4" 

Yes. 

1 Swiv. 

10 

13 
T6 

90 & 150 
3^x12" 
82x68" 

63x54x62 



2800 lbs. 

3200 lbs. 

32" 

9" 

20" 

51x12" 
45x12" 
11%" 
4 
16 
3" 
12 
.006 to .187 

W 

413" 

Yes. 

3 Plain. 

11 

it 

90 & 150 

3^x12" 

98^x72" 

66x64x66 



4S THE CINCINNA TI MILLING MA CHINE CO. 



ATTACHMENTS 

FOR 

MILLING MACHINES. 



All attachments can be used on the machines interchange- 
ably, the table -slots being finished to a standard gauge. 
Attention is called to this feature, as the machine can be 
ordered without attachments, and at any future time, these 
attachments can be supplied to fit an}' machine previously 
bought. When ordering, it is very necessary to specify the 
size of machine for which the attachment is wanted. 



THE CINCINNATI MILLING MACHINE CO. 



UNIVERSAL INDEXING AND DIVIDING HEAD. 




FIG. 20. 



The above illustrates a new Universal Indexing and Dividing Head 
with Patent Back Center. A number of new features and improvements 
are embodied in this head which is very compact and rigid. It is dis- 
tinctly universal, as swiveling block which carries spindle makes a com- 
plete revolution. This is an important feature and a great advantage on 
certain kinds of work. In starting a cutter on work held in a chuck or on 
mitre and bevel wheels, of small diameter especially such with long hubs 
or small holes, it has been a difficult matter to prevent gouging of the 
cutter. This trouble is overcome on this head by swinging the spindle 
over on the other side of the vertical line, the cut now being of a sweep- 
ing nature. With the work held in this position, heavier cuts can be 
taken, the feed may be faster, and a smoother finish will be obtained. 
Right and left hand work may be cut without changing the cutter. 

The block carrying the spindle is always fully contained within its 
bearings, at whatever angle the spindle is held. A circular T slot, similar 
to that of a planer head, is turned in one side of the swiveling block. By 
means of two T bolts in this slot and an additional clamping device on 
the other side, the swivel block is firmly held in any position. This cir- 
cular T slot is entirely concealed and can not become clogged with chips. 

The spindle receives the same arbors as the main spindle of the 
milling machine, and it will take work through its entire length i T ^ 
inches diameter. The front end of spindle is threaded to receive a 6 inch 
universal chuck for all Universal machines except Xo 3, which is fitted 
with a 9 inch chuck. When not in use, the thread is protected by a 
collar. The chuck fitting this spindle is also made to fit the main spindle 
of the machine. The spindle itself is provided with a clamping device by 



5 o THE CINCINNATI MILLING MACHINE CO. 

means of which it can be firmly locked during cutting operation relieving 
the worm and worm wheel and index pointer of all strain, and thereby 
avoiding unnecessary wear. 

The head is provided with two dividing mechanisms, viz., worm and 
worm wheel with side index-plate, and cup-shaped index plate without 
worm and worm wheel. The side index-plate is made of large diameter 
and sufficiently thick to have enough circles of holes drilled on its two 
surfaces for all division up to 360. This avoids the use of extra plates 
and frequent changing. For rapid indexing on such work as milling 
reamers, taps, nuts, etc., and cutting spur wheels with less than 40 teeth, 
the worm ma}- be disengaged from worm wheel and cup-shaped index 
plate used. This is fastened by a nut directly on spindle and may be 
used on divisions of 3, 4, 6, 8, etc., to 38. In cutting a small number of 
divisions on other heads having only the worm mechanism for dividing, 
mistakes are frequently made in counting the number of turns of worm. 
This is overcome on this head as on all divisions of forty and above, more 
than one turn of the worm is never required. 

The tail-stock has the patent adjustable center bar, which is raised 
and lowered by means of rack and pinion for taper work. The center bar 
has a small center on one end with top milled off, and a large center for 
heavy work on the other. The slide of tail-stock is adjusted by a screw 
for putting in and taking out work. There are two clamping bolts, one 
for locking center bar and the other for locking slide. 

Eight change gears are furnished with Universal machines for cutting 
spirals, both right and left, automatically. 

Two sizes of this head are made, one to swing 12 inches, another 10 
inches. Raising blocks 2 inches and 4 inches thick, however, can be fur- 
nished to take in work 16 and 20 inches diameter on the 12 inch head and 
14 and 18 inches diameter on the 10 inch head. 

By means of the angle plate, the head can be set at any angle on the 
table. 

Weight, 10 inch, 135 pounds ; 12 inch, 20S pounds. 



THE ( '/.YcV.Y.Y. / Tl MILLING MACHINl i l ' 



PLAIN INDEXING CENTERS. 




FIG. 21. 



These Centers take in work 12 inches in diameter and are intended 
for use in shops where spirals and bevel gears are not required to be cut. 
Raising blocks 2 inches and 4 inches thick can be furnished to take in 
work of 16 and 20 inches diameter. The spindle is threaded and in the 
front end has Xo. 10 Brown & Sharpe taper hole, with a 3 4 straight hole 
extending through. The spindle is firmly locked in position by the 
clamping screw shown, thereby avoiding unnecessary strain and wear on 
index pin and index plate. Two plates are regularly furnished for 
making divisions up to 100. Special plates furnished to order. The tail- 
stock has the patent adjustable center bar, on one end is a full round 
center and on the other a center with the top milled off. The center bar 
is raised or lowered for taper work by means of a rack and pinion. 

A lateral adjustment for spindle is provided for taking out work. 

Weight, 128 pounds. 



THE CINCINNA TI MILLING MACHINE CO. 



RACK CUTTING ATTACHMENT. 




FIG. 23. 



This attachment is constructed to revolve the milling cutter trans- 
versely to main spindle of machine, permitting racks of any length to be 
cut. It can also be used to an advantage for cutting off stock. Two sizes 
are made. No. i is adapted to Nos. I, 2 and 3 Plain and Nos. 1, 1%, 2 
and 3 Universal machines, and will cut racks up to 6 pitch 2 inches wide, 
using standard size cutters. A vise 30 inches long for holding work is 
furnished with this attachment. 

In ordering, the size of the machine must be given for which the 
attachment is wanted. 

No. 2 is made only for No. 3 Plain and No. 3 Universal machines and 
with special cutters of large diameter, racks up to 3 pitch can be cut. 
The vise for this size will work 34 inches long and 5^ inches wide. 

Weight, No. 1, 175 pounds; No 2, 400 pounds. 



/'///■■ CINCINNATI MILLING MACHINE CO. 



HIGH SPEED MILLING ATTACHMENT. 

For Nos. J, \ y 2y 2 and 3 Universal and Nos. J, 2 and 3 Plain Milling Machines. 




means of two pulleys mounted on 
on the end of overhanging arm. 
feeds ; also of cone driving 
pulley in the usual manner 
and provides a large number 
of speeds for the end mill. 

On the No. i Universal 
and No. I Plain machines 
there are eight changes of 
speed, from 284 to 1564 rev- 
olutions per minute. On 
the Nos. \}/ z and 2 Universal 
and No. 2 Plain milling 
machines there are eight 
changes of speed from 38S to 
1578 revolutions per minute. 

In ordering, the size of 
the machine must be given 
for which the attachment 
is wanted. 

Weight, 55 pounds. 



This attachment is advan- 
tageously used for light milling 
with small end mills. The spin- 
dle has a No. 4 Brown & Sharpe 
taper hole and runs in a Phos- 
phor Bronze shell that fits the 
taper hole in main spindle. The 
above attachment is driven by 
l bracket, which is clamped in position 
This method allows the use of power 




FIG. 23. 



THE CINCINNA TI MILLING MA CHINE CO. 



VERTICAL SPINDLE MILLING ATTACHMENT. 




FIG. 24. 



This attachment can be advantageously used on 'various kinds of 
work, such as key seating, die-sinking, cutting T slots and work which 
can not be conveniently or properly held to use a horizontal milling 
cutter. It is well braced and rigidly held in position. The vertical 
spindle is driven by means of bevel gears and shaft in main spindle. . It 
can be set at any angle, a graduated index being provided. The No. I 
attachment is adapted to Nos. i, 2 and 3 Plain and Nos. 1, \ x / z , 2 and 3 
Universal machines. Distance from center of spindle to face of column 
8 inches. Hole in spindle No. 7 Brown & Sharpe taper. An "A" Collet 
is furnished with the attachment. In ordering, the size of the machine 
must be given for which the attachment is wanted. 

Weight, about 72 pounds. 



THE CINCINNATI MILLING MACHINE CO. 



55 



CAM CUTTING ATTACHMENT. 




FIG. 25. 



Face and cylindrical cams can be cut with the Cam Cutting attach- 
ment. The change from face to cylindrical cam cutting is readily made 
by turning the worm wheel spindle at right angles to milling machine 
spindle. The bolt holes in the slide and in the spindle housing being jig 
drilled allow this change to be made quickly. 

The worm gear is large in diameter. Provision is made for taking 
up the end play of the worm and also an} ? looseness between the worm 
and worm wheel. 

The spindle can be turned either by hand or by power. Cam cutting- 
can now be done on a milling machine as well as on a special machine 
built for this purpose. 

Weight, 259 pounds. 



56 



THE CINCINNATI MILLING MACHINE CO. 



CAM CUTTING ATTACHMENT. 




FIG. 26 



The Cam Cutting Attachment applied to the cutting of a face cam is 
shown in Fig. 26. The device consists of a sliding head-stock E, and a 
base-plate A, which is fastened to the table K of the milling machine. 

Within the head-stock B, there is a spindle which may be driven 
through worm S and worm gear G, by a belt running on pulley P. 

An. extension of the worm-shaft (not shown in cut) is milled to 
receive a crank for hand feeding and adjusting work. The power feed 
should be used wherever possible, as its regularity of motion overcomes 
the resistance of any irregularities due to the form of the cam. 

The worm gearing is large and powerful. Provision is made for 
taking up the end play of the worm, and also any looseness between the 
worm and worm-wheel. 

On the spindle of this device is attached a master cam F, which 
engages with the roller R, located on a bracket rigidly attached to the 
base plate A. The sliding plate C, is held in working engagement with 
this roller by the heavy weight W. In this w r ay, the work is so fed to the 
cutter as to prodnce a true counterpart of the master cam. 

When cutting cylindrical cams, the axis of the work has to be set in 
line parallel with the slide plate A. The cutting of cams with this device 
in connection with the milling machine is performed as perfectly as upon 
an expensive machine, expressly built for such work. 

When cams are cut out of the solid stock, a roughing cutter should 
be used first ; this cutter is usually T X g of an inch less in diameter than the 
finishing cutter, which must have the same diameter as that of the roller 
intended to work in this cam. 

Where the master cam is of exact size as the cam to be cut, the master 
roller R must be the same diameter as the finishing cutter and the axis of 
the roller must be in line with the axis of the cutter, but where the master 
cam is of larger diameter than the cam to be cut, the roller R must be in- 
creased in diameter correspondingly; that is to say, the ratio of the diameter 
of the roller to the diameter of the finishing cutter must equal the ratio of the 
greatest throw of the master cam to the greatest throw of the cam to be cut. 
In the latter case, the roller and the finishing cutter are no longer in line on 
account of the size of the master cam. The roller must be moved from its 
position opposite the cutter far enough to give room for the master cam. 



THE CINCINNATI MILLING MACHINE CO. 



ROTARY MILLING ATTACHMENT. 




FIG. 27. 



This attachment is well adapted for milling circles, segments of 
circles, circular slots, etc., and circular surfaces, especially those which 
end abrubtly or merge into straight surfaces are also easily milled. It is 
used with the vertical spindle milling attachment to good advantage, and 
may be attached to any machine. 

The milling machine table to which the attachment is bolted is held 
stationary when circular milling is being done. When bolted to the 
milling machine table, the circular table of the attachment can be turned 
to any required position. The circular table can be turned by hand or 
automatically. The table is 15 inches in diameter and has 4 T-slots %" 
wide, finished to the same gauge as the milling machine table-slots. The 
attachment is 2>H inches high. 

Weight, So pounds. 



THE CINCINNATI MILLING MACHINE CO. 



VISES. 

Vise shown in Fig. 28 swivels, has a graduated base and ends of jaws 
open for better clamping long work in an upright position. The base is 
provided with tongues which fit T-slot in table. The 
jaws are made of steel. The No. 1 Swivel Vise is fur- 
nished with Nos. o, 1 and 2 Plain and Nos. 1,1% and 2 

Universal and 
the No. 2 with 
No. 3 Univer- 
sal M i 1 1 i n g 
Machines. The 
plain Vise 
shown in Fig. 
29 is flanged for 
clamping. It 
may be held 
parallel or 
right angular 
to table as 
tongues are detachable. The No. 1 may be used with Nos. o, 1 and 2 
Plain or Universal Machines. The No. 3 is regularly furnished with the 
No. 3 Plain Milling Machines. 






FIG. 21). 



DIMENSIONS. 



SWIVEL. 


PLAIN. 


Size. 


Depth 
of Jaws 


Width 

of Jaws 

6" 

7 


Jaws 
Open. 


Weight. 


Size. 

I 

3 


Depth Width 
of Jaws of Jaws 


Jaws 
Open. 


Weight. 


I 
2 


its 

if* 


4 l 4" 


50 
75 


i T % 6" 

2/s 8" 


3'A" 


35 
90 



THE CINCINNATI MILLING MACHINE CO. 



ARBORS FOR MILLING MACHINES. 



We carry in >tock Arbors as listed below. The large 
hexagon nut shown at E, Fig. 30, is used for backing out 
Arbor, by forcing this nut against the end of spindle. 





















1-1 

; '- ! 


— B -w 


D 






1 


hf * HnF 


*d 










" Af,V GROUND 








FIG. 30. 








length B 








Xo. 


Diameter 
A 


from 

Shoulder 

to Nut. 




Xo. Machine Where Used. 


Xo. of 
Taper. 


04 


V 


IV 




Xos. 0, I and 2 Plain 

and 
t, 1 'i and 2 Universal. 


7 


07 




4" 






9 


oS 









Xo. Plain. 


9 


09 


I" 


6" 






9 


1 


w 


4" 






-10 


2 


w 


4" 






10 


3 


I " 


4" 






10 


4 


1 A" 


4" 






10 


5 


itf" 


4" 




No. 1, r *-,' and 2 Universal 


10 


6 


w 


6" 






10 


- 


I " 


6" 




and 


10 




^v 


6" 






10 


9 


iX" 


6" 




Xos. [ and 2 Plain. 


10 


10 




8" 






10 


11 


I // 


8" 






10 


12 


ijV 


8'' 






10 


15 


*X" 


s" 






10 


15 
16 


1 " 

iX" 


8" 
8" 

io // 
10" 




Xo. 3 Universal 

and 

Xo. 3 Plain. 


11 
11 
11 
11 



6o 



THE CINCINNA 77 MILLIXG MA CHIXE CO. 



A NEW MILLING MACHINE DOG. 




FIG. 31. 



Often taper work is done on a milling machine between centers, 
and an ordinary dog with a bent taper tail is used for carrying the 
article to be milled. Referring to Fig. i, it will be noticed that the 
action which takes place by revolving the work is a continuous gaining 
and losing one. This is due to the fact that the bent tail continuously 
changes its position at the point of driving. It can readily be seen that 
it twists right and left, and at the same time slides forward and back as 
the dog changes from the vertical to horizontal position in turning over. 
Now if the set screw which holds the tail to the dog carrier is not 
released for every partial revolution, the tendency is to either spring or 
bend light work, or it will throw an enormous strain between centers 
on heavy work, so that it is almost impossible to revolve it, causing 
uneven divisions. Figs. 2 and 3 represent a milling machine dog 
in which the above defects are overcome. The tail of the same 
is turned cylindrical, and is offset, so that the center line through 
the cylindrical part is in line with the end of the work when the dog is 
set flush. In addition to the dog there is an adjustable clamp attached 



THE CINCINNATI MILLING MACHINE CO. 

to the regular dog driver, which firmly holds any size dog and at the 

same time admits the tail to swivel either way or slide forward and 
backward. With a dot; and clamp of this design, taper or straight work 
may be revolved between centers and held firmly in any position without 
any strain whatever. The same arrangement can be used on lathe work, 
and it is especially advantageous for thread cutting, for two reasons. 
First, where taper threads are cut between centers with the old style dog, 
the action of losing and gaining on the thread takes place the same as in 
the milling machine work, and produces what is called a drunken 
thread ; by using the improved dog this trouble is entirely avoided. 
Second, there is no back lash in reversing the lathe, and a dog of this 
pattern is always on time. 

All sizes from )\" to 2> 2 /// are made and furnished with a well- 
finished tool steel screw (threaded in the lathe) with a tempered point. 

Sizes made are #", y % " ', y 2 " , #", %", i", i%" , \)/ 2 " , 2" and 2^". 



THE CINCINNA TI MILLING MA CHINE CO. 




FIG. 33. 






FIG. 35. 



THE LY.VCY.Y-Y.-J 77 MILLING MACHINE CO. 



CUTTERS. 

Milling Cutters may be classified in four distinct types. The 
first and probably the most common form is known as the 
axial. Fig. 32, in which the surface cut is parallel to the axis of 
the cutter. This cutter has teeth on its periphery only ; these 
may be straight or spiral teeth. Cutters of this character, 
made in appropriate widths, are used very much for milling 
broad flat surfaces, and for cutting key- ways in shafts. For 
deep cuts, or for slitting metal, they are made of large diameter 
and thin. These are called metal slitting saws and are ground 
hollow on the sides for clearance. 

The second class of cutters is known as the radial, Fig. 33, 
in which the surface cut is perpendicular to the axis of the 
cutter. These cutters are called radial because their teeth are 
used in a plane parallel to the radii of the cutter. End mills, 
face mills, butt cutters, etc., are all tools in this class. 

The third class of cutters is the angular, Fig. 34, in which 
the surface cut is neither parallel nor perpendicular to the axis 
of the cutter, but is at some angle with this axis. Frequently, 
cutters are made with two different angular cutting edges, in 
which case the angle is marked on each side. 

The fourth class of cutters is the form cutter, as shown in 
Fig. 35. The cutting edge in this class is of an irregular out- 
line. When properly backed off, these cutters can be ground 



64 THE CINCINNA Tf MILLING MA CHIXE CO. 



and retain their original form. Gear cutters, tools for grooving 
taps, etc., are all classed as form cutters. 

Fig. 36 shows an inexpensive method of attaching the tool- 
steel cutter, A, to the taper shank, B, which ma}- be made of a 
cheaper grade of steel. A rod can be screwed into the tapped 
hole C from the back end of the spindle to hold the taper 
shank tight in the spindle. 

The three following pages illustrate a number of cutters 
which are used on milling machines. In most cases, it is 
advisable to use a cutter of small diameter rather than of large 
diameter. Cutters from 1% to 2 inches in diameter are the 
most economical for general milling:. 



THE CINCINNATI MILLING MACHINE CO. 






GANG OF 
MILLING 
CUTTERS. 




FIG. 36. 






THE CINCINNA TI MILLING MACHINE CO. 




GENERAL FLAT SURFACE MILLING. 




FOR KEY-SEATS. SLOTS, AND 

STRADDLE MILLING 

WHEN USED IN PAIRS. 





FOR SAWING AND SLITTING. 



RIGHT-HAND CUTTER. 

FOR RATCHET TEETH, 

TEETH IN MILLING 

CUTTERS. 




RIGHT-HAND CUTTER. 

FOR CUTTING TEETH IN SPIRAL 

MILLING CUTTERS. 




HOW TO ADJUST CUTTER TO 
WORK FOR CUTTING SPIRALS 



THE C1XCIS \AT1 Mil l.l\i, .!/./( lll\ I C'< 




CONCAVE AND CONVEX CUTTERS FOR 
MILLING HALF CIRCLES. 



FORMED MIFFING 
CUTTER FOR MILLING 
PARTS OF MACHINERY. 




FOR TAPS AND 
REAMERS. 




FOR TEETH IN GEAR- 
WHEELS. 




FOR GROOVING 

STRAIGHT-LIPPED 

TWIST-DRILLS. 




RIGHT-HAND CUTTER. 
T-SLOT CUTTER. 




FOR END-MILLING, DIE-SINKING. AND MILLING SLOTS. 



68 THE CINCINNATI- MILLING MACHINE CO. 




RACK CUTTING ATTACHMENT AND VISE. 



(See Page 52). 



EXAMPLES 

OF 

MILLING 



THE CINCINNATI MILLING MACHINE CO. 
























LH 










^s 


|5jl 







MS 

By 




THE Cf.VC/.V.y \TI MILUXG MACHIXl ( 



EXPLANATION OF CUTS ON OPPOSITE PAGE. 



Figure i. Illustrates milling hexagon nuts or heads of bolts 
with a single cutter. 

Fig. 2. How a number of nuts, strung on a mandrel, may 
be milled at the same time with two cutters. 

Fig. 3. How to mill a lot of caps, accurately finishing the 
sides and bottom at the same time. 

Fig. 4. How to mill a T slot having the groove milled to 
proper depth. 

Fig. 5. How to mill a V slot. 

Fig. 6. How to mill the guides of a housing. This can be 
done with a cutter the width of guide, or with a saw about 
J 4 -inch thick, finishing one side and then the other. A small 
cutter should then be applied to finish inside bearings. The 
housing requires but one chucking. 

Fig. 7. How to turn out a hole with a boring bar arbor. 
Various work can be drilled and bored out to advantage in this 
way, by either bolting the work on the table, holding it in a 
vise or between centers. 

Fig. 8. How to mill a key seat. This may be done holding 
the shaft in a vise or between centers. 

Fig. 9. How to mill a taper reamer with center bar in tail 
stock elevated. 

Fig. 10. How to cut a number of gear wheels when strung 
on a mandrel. 

Fig. 11. How to mill a tap. 

Fig. 12. How to hob a worm wheel after the teeth are cut. 
This operation gives the teeth the proper shape, so that the 
shafts will work at right angles to each other. 



THE CINCINNA TI MILLING MA CHINE CO. 





Mil 





23 (r 


a 
1 



i 



THE CINCINNATI MILLING MACHINE CO. 



EXPLANATION OF CUTS ON OPPOSITE PAGE. 



Fig. 13. How to cut off pieces of metal. 

Fig. 14. How to mill a thread chasing tool. The milling 
cutter is to be V shaped and 60 degrees. Mill one side first, 
and then the other, without re-chucking. 

Fig. 15. How to mill an angle, finishing sides and bottoms 
at the same time. 

Fig. 16. How to mill a slot with a small cutter. 

Fig. 17. How to mill a fork true with its round shank. One 
end is held in a universal chuck, which is screwed on the 
spindle of the indexing center, and the other held in a 
steady rest. 

How to cut a rack. 

How to mill boxes perfectly true with the hole. 
How to mill an angular cutter. 
How to index dial plates. In this case the tool 
does not revolve. 

Fig. 22. How to mill a cam. 

Fig. 23. How to mill a friezing bit for wood work. First, 
the sections are milled out with a square faced cutter, and then 
the cutting edges are milled by placing a right and left angular 
cutter on the milling arbor. These bits can be milled complete 
before removing them from the mandrel. 

Fig. 24. How to cut off round or square stock, 03^ placing 
the universal chuck on the main spindle, and using the over- 
hanging arm for a length gauge. 



Fig. 


18. 


Fig. 


19 


Fig. 


20, 


Fisr. 


21 



THE CINCINNA TI MILLIXG MA CHIXE CO. 




FIG. 37. 



THE CINCINNATI MILLING MACHINE CO. 



EXAMPLES OF MILLING. 



Fig. 37 shows how the two cutting edges of the angular 
milling cutter A, may be cut without removing the work from 
the spindle. In the position shown in full lines, the dividing 
head spindle is set below the horizontal 23^ degrees, which 
allows a horizontal instead of a vertical cut to be taken. 

A vertical cut would be necessary if the spindle could not be 
deflected as shown. The dotted lines indicate the position 
necessary for milling the end teeth. 

In setting the dividing head spindle from one angle to 
another, the spindle is slightly revolved on its axis due to the 
action of the worm on the worm wheel. Therefore, before 
cutting the end teeth, revolve the dividing head spindle slightly 
by moving the index pin one or more holes forward or back- 
ward, as the case may require. 



76 



THE CINCINNA TI MILLING MA CHINE CO 




FIG. 38. 



THE CTNCINNA TI Mil. I. IXC, MACHINE CO. 77 



EXAMPLES OF MILLING. 



Fig. 38 shows the manner of cutting teeth in a Cutting 

Double- 
double angular milling cutter A, without reversing the A ngie 

angular cutter on the main spindle or taking the work C u tt '" r g 

off the mandrel. The angular cutter, on the main 

spindle, runs only in the right hand direction. The 

double angular cutter blank A, on the work spindle is 

elevated to the required angle on the right side of the 

head, in order that the cut may be of a sweeping nature 

and to prevent the cutter from gouging into the work. 

To cut the teeth on the other angle of the cutter, the 
dividing head spindle is swiveled 30 degrees below 7 the 
horizontal line. This completes all the operations 
without removing either the work A or the cutter. 

These operations could be performed with the work 
on the left side instead of on the right side of the 
dividing head, and without removing the w r ork or 
changing the cutter ; but the direction of the cut would 
have a tendency to drag the work deeper into the cutter 
and spoil it. 

Similar work can be done in the same manner by 
setting the dividing head spindle to the required angle 
to the right and left of its vertical position. It may be 
convenient in such a case to use the automatic vertical 
feed, wdiich should always be in a direction to allow the 
cutter to push the work aw r ay from it. 



78 



THE CINCINNA TI MILLING MA CHIXE CO. 



EXAMPLES OF MILLING. 



at 









Fig. 39 shows the use of the adjustable center bar in a 
lowered position for supporting the end of the cutter A, and 
similar work. This affords the advantage of a free passage of 
the cutter over the tail-stock. 



THE CINCINNATI MILLING MACHINE CO. 



EXAMPLES OF MILLING. 



The facility with which the table and its swiveling carriage 
can be turned to any degree of angularity with respect to the 
cutter spindle, offers some important advantages. 

One example is illustrated in Figs. 40, 41 and 42, which 
shows the facility with which this job has its opposite sides 
milled parallel. These illustrations also show the manner of 
milling the three T-slots in the work without re-chucking it. 

The piece is clamped with the finished surface A, on the 
table K. In Fig. 40, the table K is shown in its ordinary 
position. 

In this position, one cut across the work with the face mill, 
will finish the surface B. Then the swiveling carriage J, and 
the table K, with the work can be turned through 180 degrees, 
or half way around, as shown in Fig. 41. in which position the 
face C is milled. The two faces B and C, will become true and 
perfectly parallel to each other and perpendicular to the base 
surface A. 

Turning the table half way around does not in any way 
interfere with the automatic operation of the feed and the 
hand lever. 

After milling the faces B and C, the three T-slots can be 
milled parallel and in their proper location without re-chucking 
the work. In Fig. 42, the operations of the end mill F and 



So THE CINCINNATI MILLING MACHINE CO. 

the T-slot cutter G are shown. Slots of suitable depth and 
proper width are first milled in the face C, with the cutter F in 
either one or two cuts, according to the accuracy required. A 
similar slot is cut in face B, after the table is revolved. Then 
the head of the T-slot in the side B, is milled with the cutter G, 
after which the table is revolved and the T-slots are finished in 
the face C, with the same cutter G. 

It will be observed that the table has been swiveled three 
times to complete the eight operations on the two sides without 
re-chucking the work. On such work where the chucking is 
complicated, this feature is of a decided advantage. 



THE CINCINNATI MILLING MACHINE CO. 



SI 




E=0 



FIG. 40. 



R 



H 



3 



0=3 



II 



p 



^ 

H 



rji 




1.0 2,0 3,0 4,0 S.0 6,0 7,0 8,0 9,0 

l.-illll'lllMlliillllNlllllllllllllllllllHIlIll 



r^ 



\^ 



FIG. 41. 



i 



FIG. 42. 



THE CINCINNA TI MILLING MA CHINE CO. 



~~£7eT B nti Cut 




FIG. 43. 




FIG. 44. 



THE I IN( 'INN. I II MILLING M. 1 1 HINE c O. S3 



CUTTING BEVEL AND MITER WHEELS. 



Iii cutting bevel and miter gear wheels on a Universal 
Milling Machine, the swivel housing is set at zero and is not 
swiveled for any operation. 

Cutting Operations. 

First adjust the work so that the center line A B, Fig. 43, of 
the wheel to be cut coincides with the center line of cutter, and 
cut two or three teeth of the proper depth. 

For the succeeding operations which are explained in the 
example given below, no fixed rule can be given as wheels of 
different diameters, faces, and pitches require different settings. 

The following miter wheel has been taken as an example. 
\2 Pitch. 
32 Teeth. 
ff" Pitch Diameter. 
2 rf" Outside Diameter. 
T V" Face. 

The index chart which is furnished with every dividing head 
shows that for cutting 32 teeth, the 28 hole index circle should 
be used, and to advance one revolution and 7 holes for every 
succeeding tooth. After the first two or three teeth have been 
cut, proceed to take second cut, Fig. 43, after slightly revolving 
the miter wheel by advancing the index pointer five holes, and 
also shifting the wheel twenty thousandths out of center by 
moving the cross slide this amount out from the column. After 
this cut has been taken, proceed to third cut as follows : turn 
the index pointer back ten holes and move cross slide back 
towards column forty thousandths. 

These operations completed will produce a tooth of the proper 
form, and the remaining teeth can be cut by simply using the 
second and third operations. These figures are correct only for 
the above wheel and will vary with each wheel. 

The cutter, if properly made, will leave the small end of the 



THE CINCINNATI MILLING MACHINE CO. 



tooth of the proper thickness, and care must be taken in the 
second and third operations that the cutter does not make the 
space already cut wider on the small end of the tooth. 

If wheels must be duplicated, it is advisable to note figures 
for future reference. For the proper thickness of the tooth on 
the large pitch diameter, see table, page 122. 

It is best to set the pointers at zero on the cross slide and 
vertical slide after the machine has been adjusted for these 
operations. The depth of the teeth in miter and bevel wheels 
should be measured at the large end of the tooth and is the 
same as the depth of teeth in spur wheels, see table, page 122. 
Care must be taken that the back lash in the index pointer 
and the cross slide screw is taken up. 

In ordering cutters for miter and bevel gears, state pitch, 
number of teeth, and the length of the face of tooth. For a 
pair of bevel gears, two cutters of different 
shapes are required on account of the 
difference in the number of teeth in the 
large and small gears. 

Fig. 44 shows the direction of motion of 
the cutter and the table. 

A paper was read at a meeting of the 
American Society of Mechanical Engineers, 
held in December 1896, on cutting bevel 
and miter gears. This paper was prepared 
by Forrest R. Jones and Arthur L. God- 
dard, and was published later in the Ameri- 
can Machinist of January 21, 1897. Their 
experimental investigations were made to 
find a graphical method for determining those operations which 
must otherwise be fixed by trial. 




THE ( TNt INNA Tl MILLING M. I ( 7//.\ E i \ >. 



85 



WORM WHEELS. 



In cutting worm wheels, the work is fed up vertically into 
the cutter to the proper depth. It is also necessary to swivel 
the table. Before swiveling the table, the cutter is set central 
with the work. The angle to which the table must be set 
depends upon the pitch and the diameter of the 
worm. Fig. 46 shows a graphical method for 
finding this angle. 

For example, take a worm whose pitch is 7 
threads per inch and whose outside diameter is 
one inch, see Fig. 45. Lay off the distance 
A B, Fig. 46, equal to T of an inch. The dis- - 
tance A C at right angles to A B is the result 
obtained by multiplying the pitch diameter of 
worm, .902 by 3.14. Connect points C and B 
with a straight line, and the angle A C B 
shows the number of degrees through which the table must be 
swiveled, which is 3 degrees in this example. 

3 1 .000 inch = outside diameter. 

5 ln -098 " = depth of tooth. 




FIG. 45. 



\° is 

III,/ 



.902 
3.14 



= diameter of pitch circle. 



~v3" 



FIG. 46. 



2.83228 inch — length A C of pitch circle. 

For right thread worm wheels, swivel 
the table to the 
right, for left 
thread worm 
wheels, swivel 
the table to 
the left, facing 
either end of fig. 47. 

milling machine table. 

The angle of the thread of the worm 
should be 29 , as shown in Fig. 47. 




S6 



THE CINCINNA TI MILLING MA CHINE CO. 



To find the diameter of a worm wheel at the throat, 
Fig. 48, when the number of teeth in the worm wheel and the 
number of threads per inch on the worm are given : 

Add 2 to the number of teeth in the worm wheel and multiply 
by .3184 and divide this result by the number of threads per 
inch on the worm, and the result will be the diameter of the 
worm wheel at the throat. 

Example : Worm wheel has 40 teeth. 

Worm has 6 threads per inch. 
40 + 2 = 42 42 X .3184 = 133728 

13.3728 = 2.2288 inches = diameter at the throat 
a of the worm wheel. 



J)lJ^f*tTaf b/oR M . 
3oTM ofTMf&l 




To find the number of teeth in a worm 
wheel, when the diameter at the throat 
and the pitch of worm are given. Mul- 
tiply the diameter at throat by the num- 
ber of threads per inch on the worm, and 
then multiply this product by 3. 141 ; then 
substract 2 and the result will give the 
number of teeth. 

Example : 

Diameter at throat = 2.2288 inches. 
Worm has 6 threads per inch. 

2.23 X 6-= 13.38 

I3-38 X 3.14 = 42.026 

42.06 — 2 = 40 = No. of teeth. 



FIG. 48. 



TABEE SHOWING DEPTH OF TEETH FOR WORM WHEELS. 



Threads 
Per Inch 
on Worm. 



I 

2 

2/2 



Depth. 


Thi-eads 
Per Inch 
on Worm. 


Depth. 


Threads 
Per Inch 
on Worm. 


Depth. 


Threads 
Per Inch 
on Worm 


O.6866 

0-4577 
0.3433 
O.2746 


3 

4 
5 
6 


O.2288 
O.1716 

O.I373 
0.1 144 


7 
8 

9 
10 


O.0980 
O.0858 1 
O.0762 
O.0686 


II 
12 



Depth. 



O.0623 
O.0572 



THE CINCINNATI MILLING MACHINE CO. B7 



SPIRAL GEAR CUTTING. 



Some of the following articles on normal pitch, addendum, etc., 
relating to spiral gears, have been taken from INIr. George B. Grant's 
Hand-Book on Gears, with his kind permission. 

Normal Pitch. — " The real pitch of the spiral gear is measured on 
a section that is normal to its axis, and, as in the case of the spur gear, it 
is found by dividing the number of teeth by the pitch diameter ; but the 
shape of the tooth must be regulated by the normal pitch, or pitch of its 
normal section. The normal pitch is found by dividing the real pitch by 
the cosine of the angle made by the tooth spiral with the axis of the gear. 
Thus, if the real pitch is 5.65 and the angle of the spiral is 45 , the normal 
pitch is 5.65 divided by .707 or 8." 

The normal pitch can also be found graphically by the following 
method. 

Lay off A B, Fig. 49, to any con- 
venient scale equal to the real pitch. 
Draw another line A C, making the 
angle at A equal to the angle of the 
spiral. Draw a line perpendicular to 
A B from B and let it intersect A C. 
The length of this oblique line A C 
measured to the same scale as A B will 
be the normal pitch. 

In this example 

Real pitch A B = 5.65 
Angle of spiral = 45 ° 
Normal pitch A C = 8 

Addendum. — ' ' The addendum of the spiral gear should not be deter- 
mined by its real pitch, but by its normal pitch, for it is then usually 
possible to mill the tooth with a milling cutter that is made for a standard 
spur gear. A gear of 11.3 normal pitch and 45 ° angle should have an 
addendum of yy-j = .089." 

' ' If the addendum is determined by the true pitch when the angle is 
considerable, the tooth will be long and thin." 

Shaping the Tool. — "When the spiral gear is cut in a milling 
machine or turned in a lathe, it is necessary to give the tool the shape of 
the normal section to be cut, and this is most readily accomplished by 
shaping it for the spur gear that most nearly coincides with that normal 
section. 

"The number of teeth in the gear that is osculatory to the normal 
spiral, and therefore most nearly coincides with it, is found by dividing 




ss 



THE CINCINNA IT MILLING MA CHINE CO. 



the actual number of teeth in the gear by the third power of the cosine of 
the spiral angle. 

"For example, if we are to cut a gear \" diameter, 6 pitch, and 24 
teeth, at a spiral angle of 45 , the cutter should be shaped to cut a spur- 
gear of .yff 3 = ff = 69 teeth of T £ T = 8.5 pitch. 

" If the gear has 28 teeth of 4 pitch, and an angle of io°, the equiv- 
alent spur-gear has 29 teeth of 4.08 pitch, as the gear varies but little from 
a spur-gear. If the gear is of 5 pitch, and 15 teeth, with an angle of 8o°, 
the equivalent spur-gear has 2830 teeth of 28.7 teeth, and in general, when 
the gear has a great angle it is a worm, the section is practically that of a 
rack. Care must be taken, when the gear is a screw, and is turned in the 
lathe, that the tool should be set with its cutting edge normal to the 
thread of the screw, if it is shaped by the above rule. If the tool is set in 
the axial section of the screw, and it generally is, it should be shaped 
to the axial section of the worm and have the axial pitch and addendum. 
But when the lead of the thread of the screw is small compared with its 
diameter, the difference between the normal and axial sections is not 
noticeable." 

When spiral gears are to be used, there are several things to be con- 
sidered in their design. Sometimes a certain distance must be main- 
tained between the centers of the two gears. In some instances, it is not 
necessary to put the centers of the two wheels any certain distance apart, 
because there is ample room for the gears to work in, and in such a case, 
a spur-gear cutter on hand may be used, and the problem is to determine 
what spiral gears can be cut with a given spur-gear cutter. 

The following example shows, when the distance between the centers 
of the spiral gears is given, see Fig. 50, how to find 

1. The Real Pitch. 

2. The Normal Pitch or Pitch of Cutter. 

3. Number of Teeth in Spur-Gear which is oscu- 
latory to the spiral. 

4. Outside Diameter of Gear. 

5. Depth of Cut. 

6. Ratio of Change Gears on Dividing Head and 
Lead Screw. 

Distance between centers = 3 T V' 
Therefore pitch diameter = 3 I 3 g // 
Circumference at pitch line = 3.1S75 X 3- I 4 I 6 = 

10.013 or IO - 
Assume 18 as the number of teeth. 

18 1. _ 




FIG. 50. 



Then the real pitch 
5-65 



pitch diameter 



THE CINCINNATI Ml 1.1. ISC MACHINE CO. 



The Norn a i. Pitch = / v -V = 5 — =8 pilch. .-. S pitch = pitch of 
Cos. 4s .707 r r ^ 

cutter to cut gear. 

NUMBER OF TEETH in spur gear which is oscillatory to the spiral 
U ._ 5S+-5I teeth. 

Outside Diameter = pitch diameter - _ = * T 3 , -i_ \ [ = 7 " 



Normal Pitch 



Depth of Cut = 2I 5/ — = .267 

Normal Pitch 



Ratio of Change Gears on dividing head and lead screw. The 
lead of a spiral of 45 ° always equals the circumference of the pitch 
diameter. In this case, the circumference of the pitch diameter is 10 
inches. Therefore, the lead of the spiral is 10 inches. Gears of the same 
size on both lead screw and worm shaft will cut this spiral. In order that 
the gears may have a possible number of teeth, it is necessary that the 
lead shall be a number which will work in readily. 

For example, if the lead is 9. 6132", then use 9.6 inches lead and 
change the pitch diameter. The ratio of the gears in this case is 1* or 

;. 6 9 6 4 S 24 6 V 4 

TOO. 1 5 2 5 5X5. 

Multiplying both numerator and denominator of a fraction by the 
same number does not change its value, therefore the product | X ! is not 
changed in value when expressed £§ X If after multiplying both, terms of 
I by 12 and both terms of f by 8. Again, if the lead is 7.962 use 8 for the 
lead and the ratio of gear on head to gear on lead screw would be j%. 

It sometimes occurs that it is not necessary to maintain a certain 
distance between the centers of spiral gears. In that case, spur gear 
cutters on hand may cut the spiral gear. 

With any given spur gear cutter, it is possible to cut some spiral gear. 
The following example may be used as a guide for finding the spiral gear 
which can be cut. 

In this example, a cutter 10 pitch Xo. 3, cutting from 35 to 54 teeth 
in a spur gear will be used. 

Multiply the pitch 10 by the cosine of the spiral angle .707 to find the 
real pitch = 10 X -JOJ = 7.07. 

Xo. of teeth in spiral gear = Xo. of teeth which cutter will cut in 
spur gear multiplied by the cube of the cosine of the spiral angle. 

Xo. of teeth in spiral gear = 35 X .707 3 = 35 X -3533 X = 12. 

Xo. of teeth in spiral gear = 54 X .707 3 — 54 X -3533 + = J 9- 

This cutter will cut from 12 to 19 teeth in a spiral gear with a real 
pitch of 7.07. 

Suppose that 15 teeth are cut in the gears, then ^- == 2. 121 = diam- 
eter at pitch circle. 



go THE CINCINNA TI MILLING MA CHINE CO. 

Total depth of tooth = tlii = .2157". 
Outside diameter of wheel = 2. 121 + fo 2.321. 

2.12 X 3-14 = 6.656 — lead of required spiral, use 6.6" lead then the 
ratio is ^§ or T 6 ¥ V 

f 55 teeth 
Given cutter 20 pitch. No. 2. < to 

( 134 teeth. 

20 X .707 = 14- 14 = real pitch. 

No. of teeth in sp. gear= 55 X -353 — = J 9- 

No. of teeth in sp. gear = 134 X -3533 = 47- 

■ x ±\± = 2.828 = diameter of pitch circle. 

Depth of cut = ^4|^ = .1078. 

Outside diameter = 2.828 .-f -.£, =2.928. 2.828 X 3- 14 = 8.879 — = *ead 
of spiral, then the ratio is -|=| = ^ = i£. 



THE CINCINNATI MILLING MACHINE CO. 



CHANGE GEARS FOR CUTTING SPIRALS. 



The worm wheel in the universal indexing and dividing head has 40 
teeth ; therefore, 40 revolutions of the worm are required to make one 
revolution of the dividing head spindle. The table lead screw has 4 
threads per inch ; therefore, 4 revolutions of the screw are required to 
move the table forward one inch. If gears of equal size were put on the 
lead screw and the worm shaft, to produce one revolution of the dividing 
head spindle, the worm shaft must be revolved 40 times. The gears 
being of the same size, the lead screw would also revolve 40 times and the 
table would travel 10 inches and these gears would give a lead of 10 inches. 

To determine gears which will give a spiral of any other lead, 
multiply the required lead in inches by 4 ; this number will be the re- 
quired number of revolutions of the lead screw for every 40 revolutions of 
the worm, necessary for one revolution of the dividing head spindle. 

«, , . number of teeth in driven gears .. 4 times the lead 

The ratio r- rz — nr^ — ^—- must equal 

number 01 teeth in driving gears ^ 40 

For example, to cut a spiral with a lead of 10 }4 inches, multiply 

io x 2 by 4=42. The lead screw must, therefore, make 42 turns while 

the worm makes 40 turns. To accomplish this with gearing, the 

number of teeth in driven gears . . 9 ,-, . ". ... 

ratio 7- j— — -T-. — -r-T—. must equal t§. This ratio £# can 

number of teeth in driving gears n * u 4 " 

be divided into two fractions without changing its value, that is J§ = 

- . Multiplying both numerator and denominator of these fractions 

by some number does not change their value, that is \ X f = % I a "d 

- :-lo- 

The ratio \% is not changed in value if it is written in this form 
\ % X If- Gears with these numbers of teeth are found among the set of 
change gears furnished with each universal machine. The gears having 
56 and 4S teeth are the driven gears and ma}- be arranged to have either 
driven from the screw, in which case, the other must be put on the worm 
shaft. 

The gears having 64 and 40 teeth are the driving gears, and either 
gear may be put on the lead screw, in which case the other must drive 
the gear on the worm shaft. 



92 THE CINCINNA TI MILLING MACHINE CO. 



From these examples, the following rules may be deduced : 
Multiply the required lead by 4. The number thus obtained will 

be the numerator and 40 will be the denominator of a fraction which 

.„ ... ,. , ,, , . the number of teeth in driven gears 

will give the ratio required, that is -r t- 7— — ^—-. — -5-5-3 5 

& ^ ' the number of teeth in driving gears. 

Resolve this fraction into two fractions. Multiply the numerator and 
denominator of each fraction by some number (not necessarily the same 
number for each fraction) so as to give numbers corresponding to the 
number of teeth in the change gears furnished with the machine. The 
numbers in the numerators will represent the number of teeth in the 
driven gears, and the numbers in the denominators will represent the 
number of teeth in the driving gears. 

Instead of using compound gearing, it is frequently much simpler to 
drive from the table screw to the worm shaft, as shown in Fig. 51. 

For example, to cut a spiral with a lead of 12 inches, the ratio of the 
number of teeth in driven gear to the number of teeth in driving gear is 
|f. If the 48 gear is fastened on the worm shaft, and the 40 gear is 
fastened on the table screw, the desired spiral of 12 inches lead will be 
produced. 

Always withdraw the index plate stop before starting to cut spirals, 
because the index plate must be free to revolve with the index pointer. 
The dividing head should be placed in that slot of the table which is 
directlv over the lead screw. 



THE CINCINNATI MILLING MACHINE CO. 



93 




FIG. 51. 



94 



THE CINCIKNA TI MILLING MACHINE CO. 




Ji &tr ; - 



G, 52, 




,*£?***> 



THE CINCINNATI MILLING MACHINE CO. 



SPECIAL JIG MILLING. 



When large quantities of pieces are to be milled, the cost 
of milling can be greatly reduced by using some special jig or 
device for either holding the work securely, or indexing the 
work rapidly. Very often, it is necessary to provide for both 
rapid and accurate indexing, and for firm and convenient 
chucking. The saving in time will more than pay for the cost 
of such jigs and devices. 

A number of illustrations are given showing some of the 
methods in practical use on milling machines. 

Two vises, Fig. 52, can be clamped side by side and used 
to good advantage. After the piece in the vise on the left is 
milled, the piece in the second vise can be brought up to the 
cutter, and while the second piece is being milled, another 
piece can be clamped in the first vise. In this manner, a con- 
siderable saving in time is effected. 

Pieces to be milled in this wa3^ are shown on left end 
of table. 



A similar use of two vises is shown in Fig. 53. The 
vertical milling attachment is used here, however. While the 
cut is being taken on one piece, another can be clamped in the 
second vise. 



9 6 



THE CINCINNA TI MILLING MA CHINE CO. 




FlC.54- 




THE c INC 'INN. I 77 MILLING M. 1 1 HINE CO. 



Fig. 54 shows a device for chucking and indexing bevel 
gears. The gear is shown at A. Two index plates B and C. 
are used for the first and second cuts. The proper adjustment 
of the cross slide must be made for these cuts. The index pin 
D, can be adjusted up and down to work in either plate. The 
hub of the gear is let down into the jig, and in this way, the 
gear is well supported against the strain of the cut. 

Xote. — These gears are 12 pitch and are fed to the cutter 
at the rate of .057 inches per turn of the spindle. 



It is difficult to cut accurately on a gear cutter the pinion 
of a back gear when both gears are cast in one piece, because 
the pinion is at the outer end of the arbor and not well 
supported. 

Fig- 55 shows a method of cutting the pinion of a back 
gear on a milling machine. The spindle of the dividing head 
stock is made long enough to extend through the back gear for 
holding it. Suitable collars are provided at B to accommodate 
different lengths of back gears. The pinion A is thus brought 
very close to the dividing head stock and accurate work can be 
done at a high rate of feed. In this manner, a 6 pitch pinion 
can be cut at the rate of .076 inches for one turn of the cutter 
spindle. 



THE CINCINNATI MILLING MACHINE CO. 




Fig. 56, 




THE CINCINNATI MILLING MACHINE CO. 



Rack-cutting is illustrated in Fig. 56. Three cutters are 
used on the cutter spindle. An indexing attachment is fastened 
to the table. To move the table to the right for new cuts, the 
pin B is withdrawn, the large gear wheel is turned by the 
crank C until the pin B again enters the slot. When the pin 
strikes the end of the slot, the table will have been moved to 
the right, the required amount for a series of three teeth by 
one turn of the crank C. 



A devise for milling the two sides of a form for bullet 
molding is shown in Fig. 57. The two sides B, B, of the form 
are held by screws to the jaws A and F. By revolving the 
intermediate gear E, the gears which are fastened on shafts C 
and D are revolved, bringing both jaws up to the cutter at the 
same time. On the shafts C and D are turned both right and 
left hand threads which mesh in nuts under the jaws A and F. 



ioo THE CINCINNA TI MILLING MA CHIXE CO. 





FlG. 59 



THE CINCINNATI MILLING MACHINE CO. 



A number of shafts can be splined at one time by clamping 
them as shown in Fig. 58. 

A vise Y, large enough to take in the four shafts, s, s, s, s, 
is clamped to the milling machine table. The four cutters are 
placed on the arbor at the proper distances from each other. 
The overhanging arm braces, B, B, combines the outer support 
of arbor with the knee. 



The back box, B, Fig. 59, for the milling machine spindle is 
made of phosphor bronze. It has a groove milled in the out- 
side for an oil wick and through this same groove is cut a 
narrow saw slot to allow the oil to pass through. The box is 
split through its entire length on the side opposite the groove. 
These three operations are performed with one chucking of the 
work and without removing the cutters from the arbor. The 
box B is put on a spindle K which revolves in the head A, and 
is clamped firmly by the washer D and the bolt C C. The 
index plug F is used to bring the box to its proper position for 
a cut. The thumb screw G is used for clamping the spindle E 
firmly in the head A. The table must be moved in or out to 
bring the cutter to be used central with the work. 



THE CINCINNA TI MILLING MA CHINE CO. 




Fig. 60. 




Fig, 6i, 



THE CINCINNATI MILLING MACHINE CO. 



The angles A, A, A, Fig. 60, are used to hold the milling 
machine tables while cutting the T slots. The angles are 
made large enough to take in all the different widths of tables. 
The lower part of each angle has a 45 degree V planed in it, to 
correspond with the V's on the tables. The gibs, G, G, G, 
which are made to take in different widths of tables, are used 
to clamp the table firmly to the angles. 



A tedious and lengthy operation is the planing of taper 
gibs. To overcome a very unsatisfactory process on the planer, 
the jig shown in Fig. 61 was devised for milling taper gibs. 
This jig is simply an angle A with a recess B, B, planed in it 
to hold the gib at the proper angle. Two clamping screws 
D, D, are used to clamp the gib on the angle. 



THE CINCINNA TI MILLING MA CHINE CO. 



ERECTION AND CARE OF THE MACHINE. 



Position 

of 

Counter^ 

shaft Cone 

Pulley. 



Shifter. 



Driving 
Belts. 

Diameter 

of 
Pulleys. 



The machine should be set level and upon a founda- 
tion as solid as can be secured. The countershaft cone 
pulley should be directly over the milling machine 
driving cone, so that the driving belt does not strike 
the cylindrical brace between the upright supports for 
the overhanging arm. 

The handle of the shifter should be to the left of the 
machine and near the middle of the driving cone. 

Both driving belts should run in the same 
direction. 

To find the diameter of pulley to be used on the 
main shaft, multiply the diameter in inches of pulley 
on countershaft by the specified number of revolutions 
per minute of the countershaft, and divide this product 
by the number of revolutions per minute of the main 
shaft ; the result will be the diameter in inches of the 
pulley required on the main shaft. 

For example, the pulleys on the countershaft of the 
No. i Universal are 12 inches diameter and run at 80 
and 150 revolutions per minute ; a certain main shaft 

runs at 140 revolutions per minute. 



Then^^° = 6-« 



I40 

inches, or about 7 inches is the diameter of pulley to be 
used on the main shaft to obtain 80 revolutions per 
minute of the countershaft. The other countershaft 
pulley runs at 150 revolutions per minute, and hence 
the diameter of the pulley required on the main shaft 



is 



12 X 150 
140 



i2f inches or about 13 inches. 



A blue print similar to Fig. 62, showing the arrange- 
ment of the countershaft is sent with each machine. 



/•///■■ CINCINNATI MILLING MACHINE CO, 



105 




FIG. 62. 



106 THE CINCINNA TI MILLING MA CHINE CO. 

On both disks of the countershaft clutch pulleys, the 
word "oil" is cast in raised letters. Xear these letters, 
an oil hole is drilled to permit the oiling of the pulleys 
while running. 

The durability, accuracy, and efficiency of a fine 
machine, depends to a great extent upon proper lubri- 
cation. Therefore, the operator should become ac- 
quainted with all oiling places and be careful not to 
neglect those plainly in sight. The interior working 
parts and the table bearings are oiled through holes in 
the table marked ' ' oil ' ' when the table is run to the 
right its full length. 

We advise the use of a good grade of mineral oil, as 
animal oils contain more or less gummy substances, 
which in due time clog up in the oil channels. 

The ends of the arbor collars should be kept per- 
fectly clean. 

As all machines are carefully adjusted before ship- 
ment, no adjustment will be necessary for some time. 
When the spindle is adjusted, it should turn readily 
by hand. 

To obtain the best results when adjustment becomes 
necessary, the construction and principles of the machine 
should be carefully studied and understood before re- 
moving or taking up the wear of any part of the machine. 

It is necessary that the bushing in the overhanging 
arm should be closely adjusted to the outer end of the 
arbor, and that the arbor should be of as large diameter 
and as short as possible. The cutter should be as close 
to the nose of the spindle as the work will permit. 



THE CINCINNATI MILLING MACHINE CO. 



DESIGN, FEATURES, WORKMANSHIP. 



The true principles of design were inquired into when 
the construction of these machines was undertaken. The 
proper selection of material and a correct disposal of it to 
the best advantage, the relative efficiencies of the different 
kinds of gear transmission especially for the operation of 
the feed mechanism, were made subjects of separate and 
extensive inquiry, which required much tedious and costly 
experimentation. The power required for driving a machine 
is frequently an important item of expense, especially ,c,enc y- 
where a shop rents power or uses an electric motor to drive 
the machine. Power is sometimes limited, and must be 
used economically. This fact makes it important that the 
machines used in such shops should be designed with a 
careful consideration of their, power efficiencies in each 
particular. 

The feed mechanism has always been regarded, even 

Feed. 
with the fine-feed practice of the past, too weak and ineffi- 
cient. Since such surprising advantages have been shown 
with coarser feeds, the former feed mechanisms have proven 
entirety inadequate. The great variety of work now done 
on milling machines, requiring both coarse and fine feeds, 
demands a wide range of feed. Recognizing this fact, the 

back-geared machines, with their greater number of spindle 

-11 1 i--i ■ ■, r- ,- -. r- Number of 

speeds, have been designed to give 12 changes of feed for changes 

each spindle speed, and those machines without back gears of Feed - 

have 8 changes of feed for each spindle speed. The table 

feed is given in thousandths of an inch travel for each turn 

of the spindle. The Nos. o and 1 Plain have a range from 

.005" to .100" ; all other Plain machines have a range from 

.oo6 // to .187". 

The No. 1 Universal has a range from .004" to .187" and 

all other Universal machines have a range from .005 /y 

to .150". 



10S THE CINCINNA TI MILLING MA CHINE CO. 

A pointer on the end of the lever on the gear box in- 
dicates on a dial the feed at which the machine is being 
operated. Throwing this lever from one side to the other, 
increases or diminishes the rate of the feeds between two 
and three times. 

Heretofore, with the narrow range of feeds on milling 
machines, it was impossible to accommodate the large 
range of cutter diameters which are required in every day 
practice. 

These cutters may range from less than y%" to more 
than 6" diameter. 

A very large part of the total power required for the 
machine is used in feeding the work to the cutter, and 
hence careful attention to the character and efficiency of 
the gearing and transmission devices used for the feed, is 
of high importance. 

Worm gearing is largely used for the transmission of 
on power to the feeds. For fixed speeds of small range, worm 
gearing may serve certain purposes, accompanied, how- 



Gearing. 



ever, by sacrifices of power. But where the power as well 
as the speed of transmission must have a large variation, 
especially where the coarsest feed is more than thirty times 
as fast as the finest feed, the use of worm gearing would 
waste an enormous amount of power. 

Geo. B. Grant, says : "The combination known as worm 
gear and worm is much used for obtaining slow and power- 
ful motions. It is also too much used for wasting power and 
wearing itself out, for its friction is very great, and con- 
sumes one-quarter to two-thirds of the power received." 

The efficiency of worm gearing is lowest for slow speeds 
(often not more than 40 per cent.) while the highest speed 
is soon reached by the tendency to abrasive cutting of the 
teeth. Cast Iron worm gears should not have a sliding 
speed for their teeth greater than two hundred feet per 
minute, and with the most favorable metals in contact, this 
speed should not be increased too much. 



THE CINCINNATI MILLING MACHINE CO. 






The practical usefulness of speed range is therefore 
limited. On the other hand, the efficiency of spur gearing 
usually ranges from S6 to 99 per cent, at almost any speed 
which might be used." 

Perhaps the most extensive experiments ever made to 
determine the relative efficiencies of worm and other toothed 
gearing, were those by Win. Sellers & Co., and these have 
been very careful ly described in a paper by Wilfred Lewis, 
printed in the Transactions of the American Society of 
Mechanical Engineers, Vol. VII. A very comprehensive 
extract from this paper is given in George B. Grant's 
"Treatise on Gears," from which the following abridg- 
ment and chart have been taken. We are indebted to Mr. 
Grant for this matter. 





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FIG. 63. 



THE CINCINNA TI MILLING MA CHINE CO. 



" The diagram, Fig. 63, shows that a common cast iron 
spur gear and pinion on parallel shafts, have an efficiency 
of from 90 to 99 per cent., according to the speed at which 
they are working ; that a spiral pinion of 45 , working in a 
spur gear, with shafts at 45 , has an efficiency of from 81 to 
97 per cent.; that the efficiency decreases as the angle of 
the shaft increases, until, for a worm of a spiral angle of 
5 , at a shaft angle of 85 , it goes as low a 34, and does not 
rise higher than jj per cent. This includes the waste of 
power at the shaft bearings, as well as that at the teeth of 
the gears. 

"The efficiency is lowest for slow speeds, and rises with 
the speed. The diagram may be relied upon to give its 
true value, under ordinary conditions, within five per cent." 
Screw We have adopted the screw feed on account of its steady 

and uniform motion. With it, when adjusting work to 
the cutter, accidental catching of the cutter on the work 
(a danger incident to rack feed) is avoided. It also affords 
a ready control where delicate feeding by hand is required. 
With the quick return gear on the right end of the table, 
the screw can be rapidly turned in either direction, and 
thus with a handle at each end, the operator is enabled to 
adjust the table while standing on either side of the 
machine. 

When machines are equipped, or intended to be equip- 
ped, with a vertical or a rack cutting attachment, nothing 
will answer better than the screw feeding table. For ver- 
tical milling, the screw feed is desirable, for the reason 
stated before. For rack cutting on the; milling machine, 
the screw is used for making accurate ^divisions for the 
rack teeth. The screw can also be used for making exact 
divisions on a great variety of other work. 

A number of distinctive features have been embodied in 
the design of these machines. Absolute accuracy is secured 
injithe alignment of the main spindle, ?and facilities for 
maintaining this adjustment are provided. Large journal 



THE i INCINNA 77 MILLING MA i III \ E < '< '. 



bearing surfaces are used, and the front box (tapered both 
inside and outside) is made of cast iron, lined with the 
best Babbitt metal, thoroughly compressed and secured ; 
the superiority of such a bearing is well recognized. The 
back bearing is made of phosphor bronze, turned to fit a 
taper bored seat in the column. Both boxes are provided 
with means for compensation as wear takes place. 

The end of the cutter- arbor is made cylindrical, and the 
bushing in the overhanging arm for its support, is con- 
structed so as to admit of being closed in concentrically as 
wear takes place. Three key-waj'S are milled in the bush- 
ing, so it can be turned one-third way round, from time to 
time. This is of great importance, as accurate milling and 
depth of cut depend upon the rigid support of the cutter 
arbor. If the arbor is not well supported, the cutter will 
chatter, and will not take heavy cuts, and the work will 
not be accurate. 

The different levers and handles for operating the 

machine are so arranged to be convenient for the operator. of Levers 

The handles on the shaft for elevating and the cross and 

. Handles. 

feed screw may be disengaged, yet remain in position for 

immediate use. With the handles disengaged, but still 

remaining on their respective shafts, there is no chance for 

the operator to accidentally disturb an adjustment. 

The double speed countershaft gives the operator two 
speeds of the cutter, without shifting the cone pulley belt ° U ^ t fI 
or changing the gearing, thus allowing a heavy cut to be Speeds. 
taken at one speed, and then a light finishing cut at a 
higher speed of rotation, which is often convenient and 
saves time. 

All Universal machines are furnished with a cross feed 
automatic in both directions, in addition to the automatic 
longitudinal feed. 

An automatic cross feed on the No. 2 and No. 3 Plain 

Automatic 

machines, and an automatic vertical feed on the No. 2 and cross 
No. 3 Plain and Universal machines, can be furnished to Feed ' 



THE CINCINNA TI MILLIXG MA CHEXE CO. 



order. The cross feed is of considerable length, and power 
cross feed proves a great advantage in boring operations, 
which can readily be done on these machines. 

All automatic feeds operate in either direction, and can 
be instantly reversed bj^ a lever conveniently located at 
front of machine. This feature, on some classes of work, 
almost doubles the output of machines with feed for table 
in one direction only. The automatic trip in either direc- 
tion is not confined between two dogs, but is thrown out b}* 
a dog constructed to permit a further movement by hand, 
without the necessity of releasing the dog. 

Ball bearings are used in the No. 3 machines on the 

f table feed screw and on all machines on the screw for 
Bearings. 

elevating. In this manner, the friction due to the thrust 
on the bearings of these screws is largely compensated for, 
and considerable efficiency is added to the power feeds and 
ease and sensitiveness to the hand adjustments. A hand 
stop for the table feed is furnished with each machine. 

For many years, we have made milling machines a 
study and their manufacture an exclusive specialty. It 
has been our constant purpose to produce the very best 
machine of its class, and we guarantee the materials and 
workmanship in our product to be strictly of the highest 
grade. All machines are subject to a careful inspection, 
and are belted and run before leaving the works. The 
table feed and the cross feed screws are provided with com- 
pensating nuts for taking up the wear. We believe that 
the manj* novel and useful features embodied in the present 
design, will commend them to all those seeking the largest 
productive capacity in the equipment of a modern machine 
shop. 



Work= 

man.ship. 



THE CINCINNATI MILLING MACHINE CO. 



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THE CINCINNA TI MILLIXG MA CHIXE CO. 



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3 8 



THE CINCINNATI MILLING MACHINE CO. 



TABLE USED FOR MAKING 



STANDARD SPIRAL MILLING CUTTERS, 



On the Universal Indexing and Dividing Head* 



Diameter 
of Mill. 


Pitch 

in inches 

to one 

turn 


Gear 
on Worm. 


First 
Inter- 
mediate 
Gear. 


Second 
Inter- 
mediate 
Gear. 


Gear 
for Screw. 


Angle 
for Setting 

Swivel 
Carriage. 


% 


7.29 


56 


48 


40 


64 


12* 


H 


9.52 


64 


48 


40 


56 


W% 


X 


9.52 


64 


48 


40 


56 


13* 


7 A 


13.71 


64 


40 


48 


56 


n* 


1 


17.14 


64 


32 


48 


56 


io* 


IX 


17.14 


64 


32 


48 


56 


13 


VA 


23.33 


64 


32 


56 


48 


11* 


ltf 


28.00 


64 


32 


56 


40 


nx 


2 


31.50 


72 


32 


56 


40 


HX 


2X 


36.00 


72 


32 


64 


40 


11 


2^ 


36.00 


72 


32 


64 


40 


12X 


W 


48.00 


72 


24 


64 


40 


10X 


3 


48.00 


72 


24 


64 


40 


nx 


3X 


48.00 


72 


24 


64 


40 


12 


3K 


60.00 


72 


24 


64 


32 


iox 


BU 


60.00 


72 


24 


64 


32 


n 


4 


68.57 


72 


24 


64 


28 


103/ 



nS 



THE CINCINNA TI MILLIXG MA CHIXE CO. 



TABLE USED IN CONNECTION WITH THE 



UNIVERSAL INDEXING and DIVIDING HEAD 



For Dividing "Work from 2 to 360 Spaces. 



















V 








V 

V 






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— 

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6 


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to 

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6 


V 

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05 
V 

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6 


V 

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2 


any 


20 




16 


24 


2 


12 


30 


24 


1 


8 


44 


66 


60 


64 


24 


15 


3 


18 


13 


6 


17 


34 


2 


12 


31 


62 


1 


18 


45 


54 


48 


65 


39 


24 


4 


any 


10 




18 


18 


2 


4 


32 


28 


1 


7 


46 


46 


40 


66 


66 


40 


5 


any 


8 


.. 


19 


38 


2 


4 


33 


66 


1 


14 


47 


47 


40 


68 


34 


20 


6 


18 


6 


12 


20 


any 


2 




34 


34 


1 


6 


48 


24 


20 


70 


28 


16 


7 


28 


5 


20 


21 


42 


1 


38 


35 


28 


1 


4 


49 


49 


40 


72 


54 


30 


8 


any 


5 




22 


66 


1 


54 


36 


54 


1 


6 


50 


30 


24 


74 


37 


20 


9 


18 


4 


8 


23 


46 


1 


34 


37 


37 


1 


3 


52 


39 


30 


75 


30 


16 


10 


any 


4 




24 


24 


1 


16 


38 


38 


1 


2 


54 


54 


40 


76 


38 


20 


11 


66 


3 


42 


25 


30 


1 


IS 


39 


39 


1 


1 


55 


66 


48 


78 


39 


20 


12 


24 


3 


8 


26 


39 


1 


21 


40 


any 


1 


• • 


56 


28 


20 


80 


34 


17 


13 


39 


3 


3 


27 


54 


1 


26 


41 


41 




40 


58 


58 


40 


82 


41 


20 


14 


49 


2 


42 


28 


42 


1 


18 


42 


42 




40 


60 


42 


28 


84 


42 


20 


15 


18 


2 


12 


29 


58 


1 


22 


43 


43 




40 


62 


62 


40 


85 


34 


16 



THE c 7.\ ( INN I 77 MILLING M. /< /// \ / I < >. 



TABLE USED IN CONNECTION WITH THE 



UNIVERSAL INDEXING and DIVIDING HEAD 



For Dividing "Work from 2 to 360 Spaces. 















u 












- 






O 

d 

Z 


* 




o 



Z 


V 

u 

'0 


X 
V 

o 

= 


O 



z 


V 

a 


a; 


c 

d 
Z 


(LI 

"3 

■z 


05 


6 

z 


V 

O 


T. 
V 



— 


86 


43 


20 


115 


46 


16 


155 


62 


16 


192 


24 


5 


245 


49 


8 


88 


66 


30 


116 


58 


20 


156 


39 


10 


195 


39 


8 


248 


62 


10 


90 


54 


24 


120 


66 


22 


160 


28 


7 


196 


49 


10 


260 


39 


6 


92 


46 


20 


124 


62 


20 


164 


41 


10 


200 


30 


6 


264 


66 


10 


94 


47 


20 


130 


39 


12 


165 


66 


16 


205 


41 


8 


270 


54 


8 


95 


38 


16 


132 


66 


20 


168 


42 


10 


210 


42 


8 


272 


34 


5 


96 


24 


10 


135 


54 


16 


170 


34 


8 


215 


43 


8 


280 


28 


4 


98 


49 


20 


|136 


34 


10 


172 


43 


10 


216 


54 


10 


290 


58 


8 


100 


30 


12 


140 


28 


8 


176 


66 


15 


220 


66 


12 


296 


37 


5 


104 


39 


15 


144 


18 


5 


180 


54 


12 


224 


28 


5 


300 


30 


4 


105 


42 


16 


145 


58 


16 


184 


46 


10 


230 


46 


8 


310 


62 


8 


108 


54 


20 


148 


37 


10 


185 


37 


8 


232 


58 


10 


330 


66 


8 


110 


66 


24 


150 


30 


8 


188 


47 


10 


235 


47 


8 


360 


54 


6 


112 


28 


10 


152 


38 


10 


190 


38 


8 


240 


66 


11 









THE CINCINNA TI MILLING MA CHIXE CO. 

















































o: 


00 


^ 


CO 


»ra 


Tf 


CO 


O? 


p_i 


© 







- ~ 












saaaSaa 


OS 


Cfi 


^ 


TP 


CM 


OS 


as 


■^ 


■^ 


Tp 
CM 


^ 




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« 
























•2 




~ ~ 


ir 






























s 






■A3-S 


























































- 




- he 


X 
































o 








CO 


— 


— 


-N? 


»o 


X 


_ 


•rP 


l<- 


© 


"J 




>, x^ 


o 






— 




S39J§3CI 


TP 


CO 


i> 


i> 


— 


o 




Tp 


CO 


X 


„ 




■fl 




















CM 






















> 


'- 


00 





























w X 


-r 




Q 


~ 




"A3"H 




















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X 




" 5 


> 




Oc 

d 








gj 


00 


?^ 


fQ 


iC 


•rp 


CO 


CM 


^ 


c 




— 




S33JS3CL 


OB 


Tp 


OS 


T 


-rP 


CX 


tP 


Ot 


"^ 


^T 


^. 




~ — 


w 




^ 


u 


r>i 




^ H 


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cm 


- 


^* 






C^3 


— 




x W 


r 




rt 


r 






























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^ 




























£ 






•A3-S 


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1—1 


^ 


— 


~ 


— 


— 


— 


— 


— 


X 




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E 










































O 








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00 


CM 


CO 


c 


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X 


CM 


?o 


CO 


- 






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o 


S39J.x53(I 


CM 


tP 


f> 


"" 


cm 


■^r 


5D 








o 




^o 3 

ST f= 






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•A3H 


CM 


CM 


cm 


CM 


CM 


O? 


O? 


CM 


CM 


N 




H 








X 


.~ 


Tp 


cm 


o 


X 


BC 


"* 


O? 


© 










saaaSaa 


CM 




CO 


— 


-<* 


— 


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CM 


iC 


CO 






^ — 


Q 




^d 


r 


m 




























o M 


Q 




£ 


'A3"H 


CM 


CM 


CM 


CM 


CM 


N 


OJ 


CM 


CM 


CM 




o 




























i 




bw 2 


X 




S 








m 


o 


lO 


o 


»c 


o 


lC 


© 


»c 


© 




00 


= 




S33-l39(J 


CO 


i> 


s 


"* 


£^ 




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CO 


X 


© 




'i - 


"2 




<J 


h 


<?t 
























^H 




— 




>d 


~ 


























W 




— j c 






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A3)I 


CO 


CO 




7^ 


CO 




CO 


CO 


CO 


CO 


X 




2 '5 






00 






























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y 


CO 


"*p 


rs? 


o 


X 


:C 




CM 


© 










I 
■- 




saaaSaa 


i-H 


"* 


1— 1 


Cfi 


Oi 


co 


X 


X 


X 


CM 


13 




I 


• — 


































•A^-a 


co 


CO 


CO 


CO 


CO 


CO 


CO 


CO 


CO 


CO 


^: 




'{■ Id 


<u 


_• 


[2 








^ 


T+ 


, 


00 


iO 


o? 


35 


;c 


CO 


© 


z 


r^ 


— 




saajgaa 


Tp 


© 


^* 


X 


CO 


r; 


i> 


CM 


b- 


CM 


-- j 




C£ (U 


_ 


> 


















Oi 










CM 












< 


H 


CO 




























"C s 


X 


— 


- 




A3-£ 


"«t 


^p 


Tp 


"3* 


-* 


Tf 


Tp 


TP 


Tf 


TP 


CO 




^ 


" 


X 

u 

u 

- 

be 


o 








rM 


Tf 


— 


ao 


o 


o> 


-rp 


CC 


X 





z 

H 
H 


- 
u 


CN 


saaaSaa 


TP 


CO 


i> 




C2 


- 


TP 

est 


CO 


CM 




° 




JC 09 


> 




•A3 "«[ 


"* 


^* 


- 


"T 


Tf 


TP 


■^ 


"<* 


^P 


^* 


r 


r> 




























— 






- 


c 


u 








f^ 


Tp 




x 


\C 


o? 


OS 


cc 


CO 


© 


B 




> aj 






~ 










CM 


CM 


CO 


"^p 


^p 


>o 


CO 


*- 









— 




^ 


J*! 
























^ 




x ~ 


. 


— 


C* 


M 


CN 
























<u 


« 


H X 


s 


>v 
























£ 






A3« 


iC 


l0 


iO 


iC 


UO 


iG 


iC 


iC 


lO 


la 


,r 


- 

V 


^c > 


aj 


X 

u 








-~ 


cm 


00 


■* 


o 


ZC 


CQ 


X 


^p 


© 


.' 


^ 


o 




•^ 


X 


S39Jx>3CI 


t 


■<* 


00 


X 


CO 


Oi 


Oi 


cc 


-x> 


CM 


«3 


t 


"K I 


aj ^ 




< 


S 


CN 


























- 
- 

X 

11 




x - r 




•-WH 


*C 


iO 


lO 


lC 


lO 


lO 


lO 


»c 


\C 


iC 


3 


H 








_, 


<*? 


CO 


r* 


»o 


cc 


1> 


X 


OB 


© 


- 




= 




s33j.Saa 


i> 


Tf 


cm 


CO 


o 


i> 


CM 


x; 


™ 


1-* 


— 


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be 3 






CN 
























•— i 


- 


—• — 


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•A9H X!COCOCOCOCOCDCOCOCO 



THE CINCINNATI MILLING MACHINE CO. 





fJ 00 




>C 


o 


xo 


o 


xo 


o 


xO 


o 


XO 


© 


O 




u 







a 




saaaS^a 


co 


CO 


a. 

1-H 




i> 




o 

CM 


CM 


00 


XO 


<L> 




■^ 




a) 




F* 
























CvJ 




13 


c 




u 






























£ 


y o 




as 


oo 


i> 


CD 


1© 


•^ 


CO 


(M 


1—t 


© 


3 




01 


be 




X 


C 


sasaSaa 


r- 


xO 


CO 


CD 


"* 


CM 


XO 


CO 


1-H 


•<* 















»-H 


CM 




1-H 


CM 




'"" ' 


CM 




rZ 




o 


CO 




.2 


































o 






^ 


_ 





























, 




c 


<r 






t^ 


■<* 




00 


\o 


CM 


as 


CD 


CO 


© 














5 


S33jg3Q 


00 


i> 


^ 


as 


00 


CM 


o 

y—i 


as 

1-H 


CO 


<M 

1-H 


<u 




c 






> 




- 
























^ 




^ 






cu 


bn 

c 


3 {N 




00 


CO 


^* 


CM 


o 


00 


CO 


T* 


CM 


© 


'Z 







a; 

CJ 




"o 






a. 


as 


t* 


Tf 


Tf 


00 


00 


CO 


CO 


CO 






o 


<v 




^ 


u 






l-H 




i - 1 


CM 




»~* 




I— 1 


CM 


■*-> 




C/2 






«i 

































































<D 




^; 


zl 






■H 


























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— 
























tn 




H 


5 




~ 




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xo 


o 


XO 


O 


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o 


xO 


o 


xO 


s 
















S93J§3a 


o 




CD 


^ 


CM 


co 


CO 


as 


as 


^d 




- 


CJ 




r< 


/-> 




— H 


CM 




1-H 




1—1 


CV 




i-H 




j5 




aJ 


^^ 








- 
























aj 




<u 


g 




CU 




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s_' 




bx 


rt 




^ 


Si 


P 00 




"M 


t* 


CD 


00 


O 


CM 


rf 


CD 


oo 


© 


z 




(L) 


- 




cu 


Q 


S33.I.O-5CT 


— i 


CM 


00 


ot 


CD 


i> 


CO 


"* 




CM 


+•> 




-rr 


,i^ 










CM 












1-H 
















nj 


~ 






























O 




H 




























a 




X 

U CO 

t cn 




_j 


CM 


CO 


-* 


ID 


CD 


i> 


00 


at 


© 




O 


OJ 




o 


C 


S33.I.§3a 


cm 


-^ 


1-H 


CO 


O 


CM 


as 




00 




•>-> 




+- 1 






+- 1 


VH 




— ' 


CM 


1—1 


CM 


i-H 


CM 




CM 




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^Cj 


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M 




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c 


bjo 




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CM 


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XO 


CO 


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o 






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CO 


Q 


S33JS3Q 


CO 




-* 


CM 


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CD 


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M 


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S33.IxS3Q 


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CO 


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c 


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S33JS3Q 


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CD 


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t- 




























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xO 


o 


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w ,£; 


3 


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S 

3 


H <£ 


S33J§3a 


as 


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00 


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CM 


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o 




ON 

o 








7 


w 




-* 


00 


CM 


CD 


o 


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00 


CM 


CD 


© 


O cu 

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cu 


H 


H ^ 


saaaSaa 


o* 


as 


2> 


-tf 


CM 


as 


CD 


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Tf 




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en 




g 2 


H 


r 




CM 


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T—t 










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s 




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00 


o 




a 


S33.l23a 


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CD 


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00 


as 


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~* 


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1-H 


1-H 


i-H 


"* 


1-1 


1-1 


i-H 


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o 




<u 


cu 


1) 


13 ^ 


































C/3 






































rt 










tP 


00 


CM 


CD 


o 


tH 


00 


CM 


CD 


© 


& 


u 










X 


s33.iS9rr 


CO 


CM 


as 




J> 


CO 


Oi 


1-H 


J> 


^ 


<u 


J5 


be 


^c . 




&2 






i-h 


1-H 






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t+1 


G 






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cC 




rt 


a 






THE CIXCIXXA TI MILLIXG MA CHIXE CO. 



TABLE SHOWING DEPTH OF SPACE AND 
THICKNESS OF TOOTH IN SPUR WHEELS, 

WHEN CUT WITH 

STANDARD INVOLUTE GEAR CUTTERS. 



Pitch 

of 
Cutter. 


Depth 
to be cut 
in Gear. 


Thickness 
of Tooth at 
Pitch Tine. 


Pitch 

of 
Cutter. 


Depth 
to be cut 
in Gear. 


Thickness 
of Tooth at 
Pitch Tine. 


2 


1.078 in. 


.785 iii. 


12 


.180 in. 


.131 in. 


W 


.958 


697 


14 


.154 


112 


2y 2 


.863 


.628 


16 


.135 


.098 


%u 


.784 


.570 


18 


.120 


.087 


3 


.719 


523 


20 


.108 


.079 


3^ 


.616 


.448 


22 


.098 


.071 


4 


.539 


.393 


24 


.090 


.065 


5 


.431 


.314 


26 


.083 


.060 


6 


.359 


.262 


28 


.077 


.056 


7 


.307 


.224 


30 


.072 


.052 


8 


.270 


.196 


32 


.067 


.049 


9 


.240 


.175 


36 


.060 


.044 


10 


.216 


.157 


40 


.054 


.039 


11 


196 


143 


48 


.045 


.033 



THE CINCINNATI MILLING MACHINE CO. 



COMPARATIVE TABLE OF 

CIRCULAR AND DIAMETRAL PITCH. 



Diametral Pitch. 


Circular Pitch. 


Circular Pitch. 


Diametral Pitch. 


2 


1.571 inch. 


2 inch. 


1571 


2X 


1.396 


\% 


1.676 


2^ 


1.257 


IX 


1.795 


%y Ar 


1.142 


IX 


1.933 


3 


1.047 


VA 


2.094 


3/z 


.898 


1* 


2.185 


4 


.785 


IX 


2 285 


5 


.628 


ll 5 6 


2 394 


6 


524 


1* 


2.513 


7 


.449 


1A 


2.646 


8 


.393 


IX 


2.793 


9 


.349 


h\ 


2.957 


10 


.314 


1 


3.142 


11 


.286 


it 


3.351 


12 


262 


X 


3.590 


14 


.224 


if 


3.867 


16 


.196 


H 


4189 


18 


.175 


16 


4.570 


20 


.157 


X 


5.027 


22 


.143 


A 


5.585 


24 


.131 


% 


6 283 


26 


.121 


7 
16 


7181 


28 


.112 


X 


8.378 


30 


.105 


A 


10.053 


32 


.098 


X 


12.566 


36 


.087 


T 3 6 


16.755 


40 


.079 


X 


25.133 


48 


.065 


iV 


50.266 



THE CINCINNA TI MILLING MA CHINE CO. 



TABLE OF DECIMAL EQUIVALENTS 



OF 



8ths, J6ths, 32nds and 64ths of an inch* 



8ths. 


32nds, 


64ths. 


64ths. 


i = .125 


fr = . 03125 


^ = .015625 


ft = .515625 


I = .250 


A = .09375 


& = .046875 


fl = .546875 


| = .375 


g % = .15625 


^ = .078125 


. f! = .578125 


i=.500 


ft = .21875 


& = . 109375 


fl =.609375 


j>=.625 


ft = .28125 


& = . 140625 


f| = .640625 


f = .750 


i-i = .34375 


ii = .171875 


ff=. 671875 


•-.875 


i : J = .40625 


if = .203125 


H=. 703125 


16ths. 


H = .46875 


i| = . 234375 


£| = .734375 


h = .0625 


H = .53125 


H = . 265625 


|| = . 765625 


rv, -.1875 


3 1 = .59375 


if = .296875 


|i = . 796875 


•>, -.3125 


|i = . 65625 


fi = .328125 


ff =.828125 


ft = .4375 


If = .71875 


f| = .359375 


If = .859375 


i 9 6=.5625 


|| = .78125 


f| = .390625 


fl=. 890625 


1 1 =.6875 


II = .84375 


fl =.421875 


If = .921875 


i 1 — .8125 


|| = .90625 


|| = .453125 


|4- = .953125 


If = .9375 


H = - 96875 


fi-=. 484375 


ff = .984375 



THE CINCINNATI MILLING MACHINE CO. 



125 



TABLE OF DECIMAL EQUIVALENTS 

OF 

MILLIMETRES AND FRACTIONS OF MILLIMETRES. 



nun. Inches. 


mm. Inches. 


mm. 


Inches. 


,V = .00079 


ft = -02047 


2 = 


.07874 


ft = -00157 


ft = .02126 


3 = 


.11811 


ft = .00236 


11 = .02205 


4 = 


.15748 


5 ^ - = .00315 


ft = .02283 


5 = 


.19685 


ft = .00394 


ft = .02362 


6 = 


.23622 


ft = .00472 


U = .02441 


7 = 


.27559 


ft = -00551 


II = .02520 


8 = 


.31496 


ft = -00630 


ft = .02598 


9 = 


.35433 


ft = .00709 


1* = .02677 


10 = 


.39370 


H> = .00787 


ft = -02756 


11 = 


.43307 


B = .00866 


ft = .02835 


12 = 


.47244 


if = .00945 


ft = .02913 


13 = 


.51181 


H = .01024 


ft = .02992 


14 = 


.55118 


M = .01102 


ff = .03071 


15 = 


.59055 


H = .01181 


U = -03150 


16 = 


.62992 


ft = .01260 


f£ = .03228 


17 = 


.66929 


H = .01339 


ft = .03307 


18 = 


.70866 


H = .01417 


U = -03386 


19 = 


.74803 


U = .01496 


ft = 03465 


20 = 


.78740 


U = .01575 


ft = .03543 


21 = 


.82677 


H = .01654 


ft = -03622 


22 = 


.86614 


ft = .01732 


ft = .03701 


23 = 


.90551 


If = .01811 


ft = .03780 


24 = 


.94488 


ft = .01890 


f| = .03858 


25 = 


.98425 


ft = .01969 


1 = .03937 


26 =1.02362 



10 mm. = 1 Centimeter = 3937 inches. 
10 cm. = 1 Decimeter = 3.937 
10 dm. = 1 Meter =39.37 

25.4 mm. = 1 Fnglish Inch. 



